How is Coat Color Controlled in Dogs?
|
|
- Kelley Jackson
- 6 years ago
- Views:
Transcription
1 How is Coat Color Controlled in Dogs? Coat color is the most challenging physical feature to assess for dogs there are multiple loci interacting (epistasis, polygenetic traits), pleiotropy, and an allelic series. Some simple problems are possible, but it would be best if students learn basic principles of inheritance using simpler autosomal and sex-linked traits, and then move up to coat color later. It is helpful if you teach students the biochemical pathway for melanin production first. After that, genotypes and phenotypes can be explained in terms of actual protein activities The specific proteins are described in more detail as part of the description of each locus. Biochemistry of Dog Coat Color The color of a dog s coat is determined by relative levels of two pigments: eumelanin, which can be either brown or black, and pheomelanin, which is yellow to orange or red. Both pigments are generated by metabolism of tyrosine. A schematic diagram of the pathway is below. Schematic of the melanin synthesis pathways.
2 Schematic showing how MC1R regulates melanin synthesis. In melanocytes, the default pathway produces yellow-red pheomelanin. This partly explains why mixed breed dogs tend to be yellow or red. Eumelanins are only made if melanocytes receive specific signals from the melanocortin receptor (MC1R; the E locus). MC1R has two main ligands: melanocyte stimulating hormone (α-msh) and agouti signaling peptide (ASIP; the A locus). Normally, ASIP and α-msh compete to bind to the receptor. When ASIP binds, melanocytes produce pheomelanin primarily; when A-MSH binds, eumelanin is produced. Animals with agouti coats have individual hairs with alternating bands of black or brown and yellow/red, corresponding to alternating binding of the two ligands. Different alleles for the A locus determine how strongly ASIP binds. Different alleles for the E locus determine how MC1R signals in response to each ligand.
3 Two other loci affect coat color. β-defensin (K locus) is a co-activator that binds to MC1R and prevents ASIP from binding. This locus is responsible for some pure black dogs. The micropthalmia transcription factor (MITF; the S locus) controls several developmental programs associated with neurogenesis and neural crest. After birth, MITF controls expression of 3 enzymes that are essential to melanin production. One of the enzymes, tyrosinase, is required for BOTH pheomelanin and eumelanin production. Mutations that block MITF prevent either color from being produced, and the animal's coat is white. The Loci Currently, 7 separate loci are thought to determine coat pattern. They control level and distribution of melanins, and thereby the vast majority of coat colors. There are a few breeds for which their coloring cannot be explained by the known genes and alleles. Work continues on uncovering these remaining regulators. Four loci (E, B, K, and A) control the relative levels and color of pigment, Three loci (D, S, and M) control distribution of pigment. There are additional minor loci that control less common coat features found in a few breeds. These have been omitted for simplicity. Coats and Noses Are Different! These 7 loci affect skin color differently than coat color. This point can confuse students. For example, a yellow Labrador retriever is that color because of the recessive e/e phenotype (explained under the E locus), but still may have black nose skin. Melanocytes in a dog's foot pads and nose skin still can produce eumelanin, even though the coat has none. Brown foot pads and nose skin are the result of a homozygous recessive genotype (b/b) for TYRP1, which also produces chocolate colored coats rather than black. If this were not sufficiently complex, cuts, scars, and normal aging can change the color of a dog's nose. The best strategy is to keep it simple, and have students focus on color of coat hair and whiskers, not nose or footpad skin, when evaluating phenotypes. (Instructors can use the black vs brown nose to double-check whether a particular dog is B/- (black nose) or b/b (brown nose) genotype.)
4 The Loci Controlling Melanin Production The Extension locus (E) This locus on CFA 5 codes for the MC1R protein, which controls whether cells can respond to melanocyte stimulating hormone (MSH), and how much eumelanin they make. There are 3 alleles at this locus: E codes for normal receptor activity. Animals will produce black eumelanin. This is the dominant allele. E M codes for enhanced eumelanin. Animals will have a black mask on their nose and face, but a lighter color on the rest of their body. e codes for a defective version of the MC1R. Dogs that are homozygous recessive e/e cannot respond to MSH, so cannot make eumelanin at all. Only colors and patterns with yellow-orange pheomelanin and white can occur. Colors associated with the E locus. 1. Karelian bear dog, showing fully black hairs, due to the E allele. 2. The black muzzle and eye-band on this German shepherd dog are due to the E M allele. 3. Homozygous recessive (e/e) dogs range from pale tan to red. Both are Labrador retrievers.
5 The Brown locus (B) This locus on CFA 11 codes for tyrosinase-related protein 1 (TRP1 or TYRP1). There are four alleles for this locus. B is wild type and dominant. It allows the normal production of black eumelanin. b is recessive. Lacking TRP1, eumelanin does not undergo final conversion, and is a milk chocolate brown rather than black. A dog that is homozygous recessive for any of these three variants will show the brown color phenotype. Chocolate Labrador retrievers show this color. o b d is the most common o b c o b s is the rarest of the recessive alleles Comparison of the black (genotype B/B or B/b; left) versus brown (b/b; right) coat color phenotypes. The Black locus (K) The K locus is responsible for the majority of all-black dog breeds. The recessive allele allows agouti coloration patterns to show. There are 3 alleles for this locus. They form an allele series; each is dominant to the allele below it in the series: K B or K Black is dominant. Dog is solid black or brown. k Br is recessive to K Br, but dominant to k y. Animals will have a mix of solid and agouti colored areas, known as brindle coloring. k y is recessive. Dogs that are homozygous for this allele will display whatever pattern the A (agouti) locus is coding for.
6 The CBD103 locus on CFA16 codes for beta-defensin 103. This immune modulator also controls coat color by binding to MC1R and increasing receptor activity. The dominant allele causes an animal to be a single solid color; it may be black or brown, depending on the alleles for the B locus. The K locus cannot produce a black dog unless there is at least one E allele for the E locus. A dog that is e/e does not produce eumelanin, so will be yellow or red regardless of the alleles at K or B. The coloration associated with alleles at the K locus. A. Black Labrador retrievers have K B /- genotype; the second allele may be any of the 3 alleles for the K locus. B. Greyhound showing the brindle pattern of bands of single and agouti colored hairs. This dog will be either k Br /k Br, or k Br /K y. C. Two yellow Labrador retrievers. They show the range in color that is possible for dogs that have only pheomelanin, from pale yellow (others can be nearly blonde) to orange-red. The Agouti locus (A) This locus on CFA 24 is unusual, in that no allele at this location is truly dominant. These alleles are dominant or recessive to each other, but all of them will be hidden by the K B or k Br allele. A dog must be k y /k y for any of these a alleles to be visible. The agouti signaling peptide (ASIP) competes with alpha-msh for MC1R binding. This results in alternating bands of dark black or brown eumelanin and yellow to red pheomelanin in individual hairs. It is important to note that agouti hair patterns still require both types of melanin; a dog that has an e/e genotype will not produce eumelanin, so it will not show agouti coloration. However, the dog can be a carrier or even homozygous for one of the a alleles. Four alleles are known for this locus:
7 a y codes for very high levels of ASIP. Animals are pale yellow to fawncolored, with a few scattered black hairs in their coat. a w is the ancestral allele. It is common in wolves but rare in all modern dog breeds. German shepherds are one of the few breeds where this allele is common. German shepherds carrying this allele are much darker on the legs, chest, and face. They lack the black and tan pattern we usually associate with German shepherds. a t codes for black and tan pattern. Typically dogs carrying this allele have black or very dark heads, backs and tails, with tan, yellow, red, or brown legs, bellies, and chests. a is the true recessive. Dogs that are a/a homozygous cannot produce pheomelanin, so are solid back. This genotype is identical to that of the dominant black locus, but has a very different inheritance pattern. Data Table 4 lists genotypes and phenotypes of dogs for the agouti locus. Different patterns produced by the A alleles. 1. Fawn color on a great Dane puppy. Like most fawn colored dogs, she has few black hairs overall. They are concentrated on her head and ears in a melanistic mask due to the E M allele. 2. Bred specifically to resemble wolves, tamaskans are a newly created breed developed from German shepherds. The distinctive mixed agouti patterns are especially clear on the dog in the back. Very likely these dogs are a w /a w genotype Large (3), mid-size (4) and small (5) dogs with the black and tan pattern associated with the a t /a t genotype for the agouti locus.
8 The Loci Controlling Pigment Distribution The Dilution locus (D) This locus on CFA 25 codes for MLPH (melanophilin). The recessive mutation at this locus does not affect total melanin production, but instead causes the pigment to remain in clumps inside hair cells rather than dispersing. This results in the color looking faded or diluted. This allele affects both types of melanin, but is most obvious when it affects black eumelanin; the result is a slate-blue or gray coat. D is the allele for normal melanin dispersion. d is the recessive allele that prevents dispersion. Left: this handsome slate blue pit bull is homozygous recessive (d/d). If it was D/D or D/d instead it would be entirely black. Right: brown dogs that are homozygous d/d can be more difficult to distinguish from normal color variation. This mixed breed dog appears to have the diluted phenotype combined with a b/b genotype, but its coat may simply be within the normal range of brown color. Other brown/dilute dogs are more obvious, because they are paler brown.
9 White & White Spotting (S) White hair in a dog's coat is due to a LACK of both melanins. Thus, the necessary alleles must prevent melanin production somehow. Evaluating white is the most challenging of all colors, because there is more than one possible pathway that can produce white dogs. A locus on CFA 20 codes for MITF (micropthalmia associated transcription factor). It is critical for development and migration of melanocytes AND controls MC1R expression. Inactivation of MITF should producea white coat. However the inheritance pattern is inconsistent, leading to different estimates of the number of alleles. There is evidence suggesting Samoyeds are pure white because they have a genotype of e/e and a/a. Pheomelanin synthesis is blocked by the "a" allele of ASIP, but the "e" alleles prevent eumelanin synthesis. This is an entirely separate path than MITF, and is not universally accepted yet. White ALSO can appear for non-genetic reasons. Dogs get white spots on their chest ( chest stars ), toes ("slippers" or socks ), and tail tip when melanocytes do not migrate completely into these locations during development. Many dogs have them, particularly mixed breeds, yet these patches of white are entirely the result of non-genetic developmental variation. Currently, we know at least 2 alleles exist for MITF: the wild type (S), and an alternate allele with a SINE insertion (s). In many pure breed dogs, S and s (inactivated by the SINE) behave as simple dominant/recessive. In these breeds a dog of genotype S/S or S/s will have little or no white in its coat. A dog that is homozygous recessive (s/s) will have a large patch of white on its belly. How far the white extends up its sides, shoulders, and chest varies a great deal. Some s/s dogs have white only on their legs chest, and belly (mantle pattern). Other s/s dogs have white extending up their shoulders and around their neck (Irish spotting pattern). Still others are randomly spotted with colors (piebald) or nearly entirely white. In a smaller number of breeds, S and s appear to be co-dominant, so that S/S dogs are fully colored, S/s dogs are mantled or Irish spotted, and s/s dogs are piebald to nearly white. Table 5 lists some of the dog breeds that have been mapped for the S locus, with genotypes and phenotypes.
10 Range of variation in white. All of these dogs are s/s (homozygous recessive) genotype. Top left: Nova Scotia tolling duck retrievers with varying degrees of white on their chests. The front two dogs have patches large enough to suggest they are not just white chest stars. As this group shows, white phenotype can be difficult to call accurately. Top right: A border collie with Irish spotting. The white forms a collar around his neck, then continues down his front legs and along his belly. Bottom left: a piebald Brittany spaniel. In piebald pattern the spots are unevenly shaped, on a mostly white background. Bottom right: Dogo Argentinos are nearly white, but will have occasional color patches. White boxers and bull terriers have similar color.
11 The Merle locus (M) This locus on CFA 10 is called SILV/PMEL17. The gene codes for two type I integral membrane proteins, PMEL17 and GP100. Both proteins are involved in pre-melanosome biogenesis in both skin and eyes. The merle pattern is a solid base color (usually red/brown or black) with lighter blue/gray or reddish patches, which gives a mottled or uneven speckled effect. Dogs often have eyes that are pale, unevenly colored or mismatched. This allele is an autosomal dominant mutation. Because it interferes with pigment cell development, dogs that are homozygous for this allele may be blind, deaf, or both. Reputable breeders will never knowingly mate two dogs that carry the merle mutation. However, merle coloring can be difficult to see in dogs that are also e/e, that is, lack eumelanin. M codes for spotty melanin dispersion. m is recessive, but is the major allele in most breeds. Left: an Australian shepherd. The mismatched, patchy coloring and mix of slate, black, orange-brown, and white indicate it is heterozygous M/m. The white collar, chest, throat, and forelegs are not controlled by the M locus, but by the S locus. This pattern of white indicates the dog is also heterozygous S/s. Right: a merle border collie. Dogs that are heterozygous M/m often have mismatched eye color. If homozygous M/M, they often are nearly white, and blind and/or deaf.
Canine Coat Colour Genetics & the Miniature Schnauzer. Presented by Catherine McMillan
Canine Coat Colour Genetics & the Miniature Schnauzer Presented by Catherine McMillan Understanding Pigment In the bottom layer of the skin's epidermis are cells called melanocytes. Melanocytes are derived
More informationColour Genetics. Page 1 of 6. TinyBear Pomeranians CKC Registered Copyright All rights reserved.
Colour Genetics Dogs have probably been domesticated for at least 15 000 years. The first dogs likely had an appearance much like the wolf or coyote. However, over the time they have been domesticated,
More informationWe are now able to offer testing for a selection of dog coat colour genes including A B D E K M and S*
We are now able to offer testing for a selection of dog coat colour genes including A B D E K M and S* Coat colour descriptions vary from breed to breed and it is important that you select the correct
More informationDachshund Genetics: Language:
Dachshund Genetics: A good breeder of any dog must know something about genetics. This page is to help those that breed as a rare hobby or those that have a kennel and wish to learn more. Genetics are
More informationHorse Coat Colours and Markings. Cindy Harper Onderstepoort Laboratory for Applied Veterinary Genetics
Horse Coat Colours and Markings Cindy Harper Onderstepoort Laboratory for Applied Veterinary Genetics Basic Colours Black Bay Chestnut Genetic Control of the Basic Colours Melanocytes produce melanin pigment
More informationFull Name: Period: Heredity EOC Review
Full Name: Period: 1 4 5 6 7 Heredity EOC Review Directions: For each genotype below, indicate whether it is a heterozygous (write: He) OR homozygous (write: Ho). 1. Tt BB DD ff tt dd dd Ff TT Bb bb FF
More informationColor Coat Genetics AMERICAN UARTER HORSE. Sorrel Chestnut Bay Brown. Black Palomino Buckskin Cremello. Perlino Red Dun Dun Grullo
AMERICAN UARTER HORSE Color Coat Genetics Sorrel Chestnut Bay Brown Black Palomino Buckskin Cremello Perlino Red Dun Dun Grullo Red Roan Bay Roan Blue Roan Gray WHAT ARE THE COLOR GENETICS OF A SORREL?
More informationJiggling Genes. By Philip Sponenberg
By Philip Sponenberg ALPACA BREEDING - CONCEPTS AND BASICS Genetics is the science of how traits pass down generation to generation. Many people think that genetics can be a predictive science - accurately
More informationA Basic Guide To Preserving The Colour Patterns Associated With The British Primitive Goat
A Basic Guide To Preserving The Colour Patterns Associated With The British Primitive Goat Raymond Werner, March 2009 Introduction Improved dairy goat breeds in the British Isles, such as the British Toggenburg,
More informationGregor Mendel. 19 th century Austrian monk Studied pea plants in his garden. Father of modern genetics
GENETICS Gregor Mendel 19 th century Austrian monk Studied pea plants in his garden Father of modern genetics Blending Theory Incorrect idea that was popular during Mendel s time Thought that an offspring
More informationTHE FASCINATING COLOUR AND PATTERN GENETICS OF THE ICELANDIC SHEEP. By: Stefania Sveinbjarnardottir-Dignum. Copyright 1994
THE FASCINATING COLOUR AND PATTERN GENETICS OF THE ICELANDIC SHEEP. By: Stefania Sveinbjarnardottir-Dignum. Copyright 1994 It is generally known that the Icelandic sheep is one of the most colourful breeds
More informationIntroduction to Genetics
Name: Introduction to Genetics Keystone Assessment Anchor: BIO.B.2.1.1: Describe and/or predict observed patterns of inheritance (i.e. dominant, recessive, co-dominance, incomplete dominance, sex-linked,
More informationThe Science of Maryland Agriculture
Edition 3 (2016) GOAL STATEMENT: Students will learn how to predict plant and animal offspring traits or characteristics using genetics. Note: Students will need to have previous knowledge of basic genetics,
More informationDo not write in margin QUESTIONSHEET 1
QUESTIONSHEET 1 Mendel s first law states that only one of a pair of contrasting characters may be represented in a single gamete. His second law states that either of a pair of contracting characters
More informationX-Sheet 4 Genetics: Inheritance and Terminology
X-Sheet 4 Genetics: Inheritance and Terminology 21 Key Concepts Genetics is a science and specific terms are used. Make sure that you know and understand the following terms before you continue. Locus:
More informationOccasionally white fleeced Ryeland sheep will produce coloured fleeced lambs.
Genetic Testing Service available for Members Occasionally white fleeced Ryeland sheep will produce coloured fleeced lambs. The Society offers members a genetic testing service, carried out by Cardiff
More informationAlpaca Coat Patterns White Spotting Genes
Alpaca Coat Patterns White Spotting Genes By: Robin Day, Several patterns of white spotting occur in alpacas (and most other animal species): tuxedo, piebald, dark-head-and-feet, appaloosa, gray, roan
More informationGenetics beyond Mendel
Genetics beyond Mendel Some exceptions to Mendel s principles: Some alleles are neither dominant nor recessive. Many traits are controlled by more than one gene (polygenic traits) Snapdragons HUH? http://www.dobermann-review.com/info/genetics/mendels_genetic_laws/gregor%20mendel.jpg
More informationHorse Coat Color Genetics and Identification. By Jesse Azevedo Last edited: 3/05/12
Horse Coat Color Genetics and Identification By Jesse Azevedo Last edited: 3/05/12 Basics Base colors: Black, Bay, Chestnut Extension (E) - whether or not true black pigment (eumelanin) can be formed in
More informationThe gene is a substance that satisfies two essential requirements:
Gregor Mendel The term genetics (in Greek, means to generate) was coined by William Bateson in 1905 Original Mendelian definition of the gene (word coined by Johanssen from genetics ):That inherited
More informationOklahoma Ag in the Classroom Coats and Genes Genetic Traits in Cattle
Oklahoma Ag in the Classroom Coats and Genes Genetic Traits in Cattle Objective The student will read about heredity and explore genetic traits in cattle. Background Agriculturists are pioneers in the
More informationGenetics of Goat Color
Genetics of Goat Color D. Phillip Sponenberg, DVM, PhD Virginia-Maryland Regional College of Veterinary Medicine Virginia Polytechnic Institute and State University Blacksburg, VA 24061 USA Introduction
More informationBy IRENE STAMATELAKYS. Homozygous tobiano and homozygous black could be winners for your breeding program, if you know how to play your cards.
By IRENE STAMATELAKYS Homozygous tobiano and homozygous black could be winners for your breeding program, if you know how to play your cards. COURTESY ANN STOCKSTILL n poker, a pair is not much to brag
More informationTopic 3 Other patterns of Inheritance (heredity) Pre Class Reading Assignment. 1. Read pgs
Topic 3 Other patterns of Inheritance (heredity) Pre Class Reading Assignment 1. Read pgs 608 610 2. Define the following terms a. Wild type b. Mutant c. Incomplete dominance d. Codominance 1 Topic 3 Other
More informationMajor aspects of Appaloosa horse coat color genetics by Sandra Sowerwine Montgomery
Major aspects of Appaloosa horse coat color genetics by Sandra Sowerwine Montgomery A thesis submitted to the Graduate Faculty in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE
More informationHaplotype analysis revealed candidate region for black/brown coat color gene in cattle
Original paper Haplotype analysis revealed candidate region for / coat color gene in cattle Shinji SASAZAKI 1, Munehiro USUI 1, Yuki YOSHIZAKI 1, Masaaki TANIGUCHI 2, Hiroshi HASEBE 3, Tsuyoshi ABE 3,
More informationGENETIC CALCULATOR (HORSE COLOUR) Help File K Yorke
GENETIC CALCULATOR (HORSE COLOUR) Help File GENETIC CALCULATOR (HORSE COLOUR) Help File All rights reserved. No parts of this work may be reproduced in any form or by any means - graphic, electronic, or
More informationGenetics and Punnett Squares
Name: Class: Date: Genetics and Punnett Squares Introduction The results of crossing two individuals can be predicted by making a Punnett square. At the top of the square, the two possible alleles from
More informationChapter 2: Traits and How They Change
Chapter 2: Traits and How They Change Section 2: Genetics Heredity x Genetics Mendel s experiments Punnett Square For the test: study the powerpoint and textbook 1)What is Heredity? 2)What is genetics?
More informationChapter 2: Traits and How They Change
Chapter 2: Traits and How They Change Section 2: Genetics Heredity x Genetics Mendel s experiments Punnett Square For the test: study power point and textbook Important Info to remember : We inherit 2
More information1) A child is born with blue eyes even though BOTH his parents have brown eyes. How is this possible?
Warm Up 1) A child is born with blue eyes even though BOTH his parents have brown eyes. How is this possible? 2) Can two blue eyed parents have a brown eyed child? Explain why or why not. Genetics: The
More informationGENETICS 20 FEBRUARY 2013
GENETICS 20 FEBRUARY 2013 Lesson Description In this lesson, we: Look at the definition of genetics. Discuss Mendel s concept of dominance & the law of segregation. Cover terminology of the genetic concepts.
More informationUnit 8: GENETICS PACKET
Unit 8: GENETICS PACKET This packet is designed to help you understand several concepts about GENETICS. As you practice the exercises on each handout, you will be able to: Make and defend a claim based
More informationChapter 3 Mendelian Inheritance
Chapter 3 Mendelian Inheritance I. Genes, Chromosomes, and Genotypes II. Germ Cells and Their Formation III. Formation of the Embryo IV.The Randomness of Inheritance V. Dominance and Epistasis VI.Sex-Related
More informationTypical KRT25 and SP6 Crosses
Typical KRT25 and SP6 Crosses Legend: Dr Mitch Wilkinson and Bunny Reveglia (AA) homozygous for KRT25 Damele, Native, Canadian, Fredell, WY Salt Wells Mustang and many Nevada mustang gene (AG) heterozygous
More informationName: Block: Date: Black Chickens _ White Chicken Erminette Chickens
Name: Block: Date: Honors Biology Incomplete/ Co-Dominance/ Multiple Alleles 1. Many genetic traits have a stronger dominant allele and a weaker recessive allele. This is known as complete dominance. Some
More informationMission to Mars. Day 8 Heredity
Mission to Mars Day 8 Heredity 7.14A define heredity as the passage of genetic instructions from one generation to the next generation 7.14C recognize that inherited traits of individuals are governed
More informationUnit 6 Review Game Page 1
Unit 6 Review Game Page 1 1 The,,, and O blood types found in humans refer to the genotype. phenotype. quality of the blood. frequency of the alleles. size of the red blood cells. 2 In a two-factor cross,
More informationGenetics Discussion for the American Black Hereford Association. David Greg Riley Texas A&M University
Genetics Discussion for the American Black Hereford Association David Greg Riley Texas A&M University Topics Managing Genetic Defects in Cattle Populations Contemporary Groupings Data Collection and Reporting
More informationTHE PALOMINO HORSE. Department of Genetics, Uniuersity of California, Berkeley, and University of Virginia, Charlottesuilk. Received March 15, 1961
THE PALOMINO HORSE W. E. CASTLE AND W. R. SINGLETON Department of Genetics, Uniuersity of California, Berkeley, and University of Virginia, Charlottesuilk Received March 15, 1961 T is the purpose of this
More information8. How many different kinds of gametes can normally be produced by an organism with the genotype RrYy? A) 1 B) 2 C) 3 D) 4
Name: Biology 3201 Heredity Assignment March 25, 2011 Part A: Multiple choice. Choose the BEST answer. If you are unsure, guess. (15 points) 1. Which branch of biology deals with the principles of variation
More informationGenetic Profile Test Results Horse: The Double Standard Owner: Alison Umberger
Horse and Owner Information Horse The Double Standard DOB 2016-04-24 Breed Paint Age 0 years, 11 months Color Sorrel Sex Mare Discipline All Around Height....... Registry APHA Reg Number 1060828 Sire Double
More informationContents. The Genetic Equation of Paint Horses
Contents The Genetic Equation of Paint Horses.........IFC Tobiano..................................1 Overo...................................1 Tovero...................................3 Breeding the Tobiano
More informationChapter 11 Mendel and the Gene Idea. What is the difference between a character and a trait? Give a concrete example to illustrate the difference.
Chapter 11 Mendel and the Gene Idea What is the difference between a character and a trait? Give a concrete example to illustrate the difference. What is a true breeding plant? How does it differ from
More informationPatterns of Intermediate Inheritance
Patterns of Intermediate Inheritance Exceptions to Mendel s Principles Mendel s 3 principles provide us with an important foundation in building our knowledge of genetics. However, there are many types
More informationIdentification of the Coat Pattern in Soay Sheep
Identification of the Coat Pattern in Soay Sheep Gevan Marrs, Woodland Creek Farm April, 2006 There are three gene loci that largely determine all the main aspects of Soay sheep coat color and pattern.
More informationGenetics and Inheritance
+ Genetics and Inheritance + Intro to Genetics Every living thing plant or animal, microbe or human being has a set of characteristics inherited from its parent or parents. Your DNA holds the genetic code
More informationThe Way I See It. The Dangers of Trait Over-Selection
The Way I See It The Dangers of Trait Over-Selection Breeding for specific traits may trigger unwanted, even dangerous, genetic side effects. By Temple Grandin Department of Animal Science Colorado State
More informationThe Science of Maryland Agriculture
GOAL STATEMENT: Students will learn how to predict plant and animal offspring traits or characteristics using genetics. OBJECTIVES: Students will apply the concepts of genotype and phenotype to scenarios
More informationDehorning cattle via genetics
IRISH CATTLE BREEDING FEDERATION Dehorning cattle via genetics Tuesday 11 th April Portlaoise 1 Outline Background Genetics of Polled gene Polled vs Horned How to increase Polled gene Breeding for the
More informationLife #4 Genetics Notebook
Life #4 Genetics Notebook Life #4 Learning Targets Life #4 Vocabulary: Eye Color what color are your eyes? Brown, Green, Hazel Dominant Blue Recessive Freckles do you have freckles? Say yes only if you
More informationGenetic Profile Test Results Horse: Happy De La Rigole Owner: Ninon Gautier
Horse and Owner Information Horse Happy De La Rigole DOB 2017-04-22 Breed Curly Horse Age 0 years, 3 months Color Buckskin Sabino Sex Mare Discipline....... Height....... Registry ICHO/NACHR Reg Number
More informationVersion: 08/03/2017 Page 1 of 5
Equine Colour and Pattern Testing AG CCC CD CHP DW(W1-22) Agouti (black pigment distribution) Chestnut/Red Factor/Extension Cream Dilution Champagne Dilution Dominant White The Agouti gene controls the
More informationMendel s Second Set of Experiments Dihybrid Crosses
Mendel s Second Set of Experiments Dihybrid Crosses Mendel s first set of experiments proved the Law of Segregation; an individual contains factors which segregate from one another during meiosis. Each
More information2015 JUNIOR COLORS & MARKINGS (easy) HIH140-1 Q: What leg marking is white from the coronet to the middle of the cannon?
2015 JUNIOR COLORS & MARKINGS EASY 1753 (easy) HIH140-1 Q: What leg marking is white from the coronet to the middle of the cannon? A: Half stocking 1754 (easy) TH78/HIH140-1 Q: What is the term for a dark
More informationQuantitative aspects of coat color in old Kladruber Black Horses. Hofmanová, B., Kohoutová, P., Vostrý, L., Vostrá Vydrová, H., Majzlík, I.
Quantitative aspects of coat color in old Kladruber Black Horses Hofmanová, B., Kohoutová, P., Vostrý, L., Vostrá Vydrová, H., Majzlík, I. Poljoprivreda/Agriculture ISSN: 1848-8080 (Online) ISSN: 1330-7142
More informationGenetic Profile Test Results Horse: Jax Owner: Amanda Palmer
Horse and Owner Information Horse Jax DOB 2017-02-11 Breed Paint Age 0 years, 3 months Color Sorrel Overo Sex Stallion Discipline....... Height....... Registry APHA Reg Number pending Sire The Sugar Daddy
More informationCOLORS AND MARKINGS GENERAL KNOWLEDGE STUDY GUIDE
COLORS AND MARKINGS GENERAL KNOWLEDGE STUDY GUIDE I. Colors Colors in the horse industry are extremely important for identification, and for breeding purposes. Color is inherited by both the sire and dam.
More informationCOLOURS of the FJORD HORSE. Colour variations. By Tor Nestaas.
COLOURS of the FJORD HORSE By Tor Nestaas. The colours of the Fjord Horse are a variety of dun colours. The central Asian Wild Horse, the Prezewalski horse and the European Wild Horse, the Tarpan have
More informationDairy Goat Breeds. Jake Dowell Spring Valley 4-H Emerald Star Project 2016
Dairy Goat Breeds Jake Dowell Spring Valley 4-H Emerald Star Project 2016 Table of Contents Alpine... 4 LaMancha... 6 Nigerian Dwarf... 8 Nubian... 10 Oberhasli... 12 Saanen... 14 Sable... 16 Toggenburg...
More informationparents to offspring.
Not all traits are simply inherited by dominant and recessive alleles l (Mendelian Genetics). In some traits, neither allele is dominant or many alleles control the trait. Below are different ways in which
More information2015 SENIOR COLORS & MARKINGS (easy) HIH140-1 Q: What leg marking is white from the coronet to the middle of the cannon?
2015 SENIOR COLORS & MARKINGS EASY 1753 (easy) HIH140-1 Q: What leg marking is white from the coronet to the middle of the cannon? A: Half stocking 1754 (easy) TH78/HIH140-1 Q: What is the term for a dark
More informationOthers traits, such as the ability to roll your tongue, or inability, are controlled by only one gene.
NC DNA DAY The Genetic Wheel Title slide Hello! Today we are going to learn about how your physical characteristics are inherited through genetic material We ll do an activity to look at some of the genes
More informationGENES AND CHROMOSOMES CHROMOSOMES IN SEX CELLS. Horse Science: How Inheritance Works in Horses Page 3. dam unite and grow into the new animal.
Horse Science: How Inheritance Works in Horses Page 3 Two tiny cells are the only links of inheritance an animal has with its parents. A sperm cell from the sire and an egg cell from the dam unite and
More informationThursday, June 7, 2018
Thursday, June 7, 2018 Objective: Use a Punnett Square to predict offspring from Mendelian and non-mendelian crosses A Do Now: Word Search, 5 minutes. Write down words you DO NOT understand. What is the
More information5/27/2018 HORSE COAT COLORS. Kashif Ishaq (PhD; DVM)
HORSE COAT COLORS Kashif Ishaq (PhD; DVM) 1 2 1 BAY HORSES Bay horses run from light reddish or tan shades to dark brown and mahogany/auburn shades. Bay horses always have black points (legs, muzzle, mane
More informationResearching Colour Patterns In The Lynton Feral Goat
Researching Colour Patterns In The Lynton Feral Goat Raymond Werner, 2009 1. A system for identifying feral goats in the field Although I have now been studying all aspects of goats for nearly 50 years,
More informationa. pink x pink b. red x white c. pink x white Genotypic Genotypic Genotypic %: %: %: Phenotypic Phenotypic Phenotypic %: %: %:
Non-Mendelian Genetics Practice Packet Most genetic traits have a stronger, dominant allele and a weaker, recessive allele. In an individual with a heterozygous genotype, the dominant allele shows up in
More informationIllustrated Standard for the Chinese Shar-Pei All pictures are copyright and may not be used without expressed permission from the CSPCA.
Illustrated Standard for the Chinese Shar-Pei All pictures are copyright and may not be used without expressed permission from the CSPCA. (Revisions- 1993, 1998) GENERAL APPEARANCE An alert, compact dog
More informationNON-MENDELIAN GENETICS:
NON-MENDELIAN GENETICS: INCOMPLETE DOMIANCE CO-DOMINANCE (aka Multiple Alleles) SEX-LINKED INHERITANCE POLYGENIC TRAITS Name: This practice contains assignments for the standards listed above. We will
More informationThe Genetics of Coat Colors in the Mongolian Gerbil (Meriones unguiculatus)
Exp. Anim. 38(4), 337-341, 1989 Note The Genetics of Coat Colors in the Mongolian Gerbil (Meriones unguiculatus) Tetsuya MATSUZAKI, Yukio YASUDA, and Shuichi NONAKA* Central Institute for Experimental
More informationGenetics Test Review
Genetics Test Review Vocabulary to Know 1) Punnett Square chart used to determine the probable outcome of genetic crosses 2) Heredity The passing of traits from parent to offspring 3) Gregor Mendel The
More informationIncomplete and Codominance
Incomplete and Codominance Snapdragons HUH? http://www.dobermann-review.com/info/genetics/mendels_genetic_laws/gregor%20mendel.jpg http://faculty.pnc.edu/pwilkin/incompdominance.jpg Explain the difference:
More informationIntroduction to be read or described to the participants:
Introduction to be read or described to the participants: When breeding animals, it is important to understand the reasons why the offspring (foal, lamb, calf, etc.) look a certain way or have the traits
More informationUnderstanding Genetics
Understanding Genetics INDEX Understanding genetics 3 Carrier mating disease risks 5 While this booklet focuses on cattle as an example, this information is useful for all species. DNA is essential to
More informationReferred to as main, tail, and legs black or darker than the rest of the horse? HH 4. Black points
Referred to as main, tail, and legs black or darker than the rest of the horse? HH 4 Black points A brand is a mark of identification that is privately registered and can be burned in what three places?
More informationChapter 10: Dihybrid Cross Worksheet
Name: Period: Date: Chapter 10: Dihybrid Cross Worksheet In rabbits, gray hair is dominant to white hair. Also in rabbits, black eyes are dominant to red eyes. These letters represent the genotypes of
More informationApplications of Linear Algebra: Genetics Armeen Moshrefi, Sarah Rogers, Meghan Wolf, Jesus Zambrano Math 247: Jen-Mei Chang
Applications of Linear Algebra: Genetics Armeen Moshrefi, Sarah Rogers, Meghan Wolf, Jesus Zambrano Math 247: Jen-Mei Chang Introduction Genetics is a branch of biology that deals with the mechanisms of
More informationT genetics. Indeed many facts concerning it had already been established
THE C OF COLOR INHERITANCE IN HORSES W. E. CASTLE Division of Genetics, University of California, Berkeley, California Received October, 27, 1947 HE study of color inheritance in horses was begun in the
More informationLight Horse Dark Horse series by Lavay Byrd Horse Guide
Horse Guide 1 2 Horse Terms Bachelor a young stallion without a herd or mate. In the wild, these young stallions usually form bachelor bands. Colt a young male horse under the age of 4 horse years. Equine
More informationArchival copy: for current recommendations see or your local extension office.
NAME ADDRESS CLUB 4-H HORSE PROGRAM HORSE SCIENCE This educational material has been prepared for 4-H use by the Cooperative Extension Services of the U.S. Department of Agriculture and State Land-Grant
More informationSHERBURNE COUNTY SHERIFF'S OFFICE FOUND ANIMALS
SHERBURNE COUNTY SHERIFF'S OFFICE FOUND ANIMALS Description of Animal Date Location Sex Breed Color Other Characteristics Case # 3/24/18 Big Lake Shepherd mix Blk face/tan and white Possibly hit by car.
More informationBertrand Langlois 1, Andrea Valbonesi 2, Carlo Renieri 2
REMAINING QUESTIONS ABOUT THE INHERITANCE OR ROAN COAT COLOR IN HORSES Bertrand Langlois 1, Andrea Valbonesi 2, Carlo Renieri 2 1 - INRA-CRJ-BIGE 78352 Jouy-en-Josas Cedex, France 2 -School of environmental
More informationFruit Fly Exercise 1- Level 1
Name StarGenetics Fruit Fly Exercise 1- Level 1 Description of StarGenetics In this exercise you will use StarGenetics, a software tool that simulates mating experiments, to analyze the nature and mode
More informationColor. genetic myths. Practical findings on Appaloosa color genetics. By Robert Lapp and Gene Carr Illustrated by Sean Murphy
042-047 GENETICS FEATURE 1/30/07 2:12 PM Page 42 Color genetic myths Practical findings on Appaloosa color genetics By Robert Lapp and Gene Carr Illustrated by Sean Murphy 42 www.appaloosajournal.com 042-047
More informationNAME pg. 1 Unit 7: Inheritance Study Guide 1. Describe what happens in each phase of Meiosis. Interphase: Meiosis I:
NAME pg. 1 1. Describe what happens in each phase of Meiosis. Interphase: Meiosis I: Meiosis II: Prophase I: Metaphase I: Anaphase I: Telophase I: Prophase II: Metaphase II: Anaphase II: Telophase II:
More informationName: Incomplete and Co-Dominance Practice Due: 01/19/17
Name: Incomplete and Co-Dominance Practice Due: 01/19/17 Most genetic traits have a stronger, dominant allele and a weaker, recessive allele. In an individual with a heterozygous genotype, the dominant
More informationBasic Mendelian Genetics & Color Genetics Basic Definitions Mendel demonstrated with corn that genes could be predictably combined.
Basic Mendelian Genetics & Color Genetics Basic Definitions Mendel demonstrated with corn that genes could be predictably combined. For horses, there are 32 pairs of chromosomes which hold 2.7 billion
More informationT acterized by very finely dispersed spotting patterns consisting of
STUDIES ON SPOTTING PATTERNS 11. GENETIC ANALYSIS OF VARIEGATED SPOTTING IN THE HOUSE MOUSE L. C. DUNN Columbia University, New York Received July 20, 1936 INTRODUCTION HE varieties of mice known to fanciers
More informationWe are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists. International authors and editors
We are IntechOpen, the world s leading publisher of Open Access books Built by scientists, for scientists 3,500 108,000 1.7 M Open access books available International authors and editors Downloads Our
More informationHORSE COLOR EXPLORED. Over 150 Breeds, Types, and Variations. Vera Kurskaya. Featuring Hundreds of Color Photos from Around the World
HORSE COLOR EXPLORED Over 150 Breeds, Types, and Variations Featuring Hundreds of Color Photos from Around the World Vera Kurskaya Contents DUPLICATION PROHIBITED Preface... v 1: Introduction to Horse
More informationINHERITANCE OF DUN, BROWN AND BRINDLE COLOUR IN CATTLE
INHERITANCE OF DUN, BROWN AND BRINDLE COLOUR IN CATTLE S. BERGE Agriculwral College of Norway, Vollebekk, Norway Received 17.i.49 Dur4, brown and brindle colours are not frequent among the cattle colours.
More informationAn Investigation of Coat Colour Distribution of West African Dwarf Goats
Journal of Agricultural Science; Vol. 10, No. 3; 2018 ISSN 1916-972 E-ISSN 1916-9760 Published by Canadian Center of Science and Education An Investigation of Coat Colour Distribution of West African Dwarf
More informationSynchroGait. Text: Lisa S. Andersson, Capilet Genetics and Kim Jäderkvist, Swedish University of agricultural Sciences (SLU).
SynchroGait Learn about your horse s natural ability for different gaits Get help from the DNA-test SynchroGait to learn about your horse s genetic potential for gaits. The test is very easy to use and
More informationMiniature Texas Longhorn Registry Reclassification Information
Miniature Texas Longhorn Registry Reclassification Information Instructions for applying for reclassification: 1. Submit a completed Miniature Reclassification Application for cattle that are at least
More informationTeddy Grahams and Natural Selection
Introduction: Wl Welcome to the land of Tdd Teddy Grahams. These bears are a peaceful, herbivorous species that has long enjoyed life without a predator. Their population size remains around 12 bears.
More information7.013 Problem Set
7.013 Problem Set 2-2013 Question 1 You are working with the following parental flies (P1-P4). P1: Light body color and normal wings P2: Light body color and wingless P3: Dark body color and wingless P4:
More informationCharolais. Origin-The Charolaise originated in west-central to. Use-They produce excellent quality beef and often are.
Charolais Origin-The Charolaise originated in west-central to southeastern France. Use-They produce excellent quality beef and often are used to improve herds of other cattle breeds. Charolais tend to
More informationBiol 321 Genetics S 02 Exam #1
Biol 321 Genetics S 02 Exam #1 Name: 1. (8 pts) The main concept in the central dogma of molecular biology is that DNA does not code for protein directly but rather acts through an intermediary molecule
More information