Coat color genetics
Download
1 / 22

Coat Color Genetics - PowerPoint PPT Presentation


  • 290 Views
  • Updated On :

Coat Color Genetics. The Reason Behind Paint Horse Coat Color. Paint Horses are a unique breed known for beautiful and colorful coat patterns. The base coat color can be any color in the equine spectrum. Superimposed over the base color are white spotting patterns. The Paint Horse.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Coat Color Genetics' - ivanbritt


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Coat color genetics l.jpg

Coat Color Genetics

The Reason Behind Paint Horse

Coat Color


The paint horse l.jpg

Paint Horses are a unique breed known for beautiful and colorful coat patterns.

The base coat color can be any color in the equine spectrum.

Superimposed over the base color are white spotting patterns.

The Paint Horse


Paint horse color patterns l.jpg
Paint Horse Color Patterns colorful coat patterns.

  • Tobiano: white markings usually cross the back between the withers and tail.

  • Overo: white markings usually do not cross the back between the withers and tail.

    • Frame Overo

    • Sabino

    • Splashed White

  • Tovero: a combination of the Tobiano and Overo coat patterns.

How are these unique coat patterns created?


Slide7 l.jpg

Coat color patterns are created by genes. Genes carry the genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.


The reason behind the coat pattern l.jpg
The Reason Behind the Coat Pattern genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.

  • Genetic inheritance determines a Paint’s coat pattern. What is genetic inheritance? It is the genes (genetic codes) parents pass on to their offspring.

  • Why is this important? It is important for Paint Horse breeders to understand genetic inheritance so they can breed for certain coat patterns, possibly raising the value of their horses.

  • What does a gene do? Genes transfer the genetic information from a parent to its offspring, determining the appearance of the offspring—including the coat color and pattern.


What are genes l.jpg

Genes genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.

Genes are the tiny, basic units of inheritance found in DNA.

Genes determine color, size, and make-up for every living species.

Each equine species receives half of their genes from their sire (father) and half from their dam (mother).

Physically, genes are linked together like a strand of pearls to form a chromosome.

What are Genes?


What are chromosomes l.jpg

Chromosomes genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.

Chromosomes are made up of genes.

Every Paint Horse has 64 chromosomes.

Each chromosome was initially created through fertilization, where genetic information from the sire (father) was united with genetic information from the dam (mother).

Loci and Alleles are also found on chromosomes.

What are Chromosomes?

Loci

Alleles

Actual photo


What are loci l.jpg

Loci genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.

The different points or markers along a chromosome.

Loci are like street signs in a busy city, allowing us to find our way along a complex chromosome.

At a specific locus, scientists can locate certain genes. These genes appear at that locus for every individual of that species.

At one locus there can be two Alleles

What are Loci?

Loci are numbered. This depicts a chromosome half.


What are alleles l.jpg
What are Alleles? genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.

  • Alleles

    • Two alleles are found at each loci on a chromosome.

    • Alleles code for the different ways a gene can be expressed.

    • For example, consider your eye color. You have a loci on a chromosome for eye color. At that loci there are two alleles—one from your mother and one from your father. The dominant of the two alleles is the eye color that you display. This is your phenotype (the eye color seen). The genetic classification (what we can’t see but what is on the loci) is called the genotype.


Slide13 l.jpg

How does genetic material compare in size? genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.


The genetic explanation l.jpg
The Genetic Explanation genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.

  • In coat color genetics, one of the goals is to identify the genes (genotype) in the parents and predict the probability of coat colors (phenotype) in their offspring.

  • As scientists identify genes that contribute to coat color, they assign them a letter.

    • Letters range from A-Z,

    • Can be capital or lower case (A, a),

    • May have a super script (Ast )

  • If Paint Horse breeders understand how genes work, they can selectively breed for certain coat colors.


What is simple dominance l.jpg
What is Simple Dominance? genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.

  • Simple Dominance explains how genes are expressed.

    • In Simple Dominance, two genes (one received from each parent) are passed on to the offspring. The parents’ genotype determines the genotypic possibilities of the offspring.

    • In Simple Dominance, one gene is dominant over the other. The characteristic for which this gene codes is physically displayed. Scientists identify this dominant gene with a capital letter.

    • The recessive form of the gene is submissive to the dominant form and will not be physically displayed. However, it will always be found in the genotype and could be passed on to this individual’s offspring. Scientists identify this recessive gene with a lower-case letter.

    • Because two genes are passed to an offspring, several pairing possibilities can occur. Homozygous or heterozygous pairing can occur in the offspring’s genotype.


What is homozygous pairing l.jpg
What is Homozygous Pairing? genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.

  • Homozygous

    • “Homo” means “same.”

    • A homozygous genotype is two of the same alleles (two dominant or two recessive) at one locus.

    • Consider the Black or Sorrel base coat colors. “E” codes for Black and “e” codes for Sorrel. E has simple dominance over e.

    • A homozygous dominant pair for Black base coat is EE. If one dominant E gene is in the genotype, the Black coat is expressed. This is an example of simple dominance because only one dominant E results in a Black coat.

    • A homozygous recessive pair for a Sorrel coat is ee. Because e is recessive, the only way a Sorrel coat will be expressed is if you have a homozygous recessive genotype of ee.


What is heterozygous pairing l.jpg
What is Heterozygous Pairing? genetic codes that create a horse’s size, conformation and color. Let’s continue to learn how genes create coat colors.

  • Heterozygous

    • “Hetero” means “different” or “other.”

    • A heterozygous genotype is two different alleles at one locus.

    • One allele of the pair is dominant, while the other is recessive.

    • For example, what color would a foal with the genotype Ee be? Remember, E has simple dominance over e, and E codes for Black where e codes for Sorrel.

  • The coat color will be Black because E is dominant.


Congratulations you have successfully finished exploring the basics of coat color genetics l.jpg

Please proceed to the “Let’s Review” portion of the presentation. Remember to use the “Let’s Review” worksheets as you see what you have learned.

Congratulations, you have successfully finished exploring the basics of coat color genetics!


Let s review l.jpg
Let’s Review presentation. Remember to use the “Let’s Review” worksheets as you see what you have learned.

  • What are Paint Horses known for?

    Answer: Paints are known for their unique coat patterns.

  • What are genes?

    Answer: Genes are tiny units of inheritance found in DNA that code for the make-up of an individual.

  • What makes up a chromosome?

    Answer: Genes make up chromosomes, loci are found on chromosomes and alleles are found at loci.


Let s review20 l.jpg
Let’s Review presentation. Remember to use the “Let’s Review” worksheets as you see what you have learned.

  • What is the title given to specific parts along a chromosome where two alleles are found?

    Answer: Loci

  • Why are there two alleles at each loci?

    Answer: Two alleles are at each loci because the offspring receives one from its mother and one from its father.

  • What is genotype?

    Answer: The genotype is the genetic material that we can’t see expressed on the outside of an individual, such as a recessive allele.


Let s review21 l.jpg
Let’s Review presentation. Remember to use the “Let’s Review” worksheets as you see what you have learned.

  • What is phenotype?

    Answer: The phenotype is the physical appearance of an individual, a characteristic that we see, such as that determined by a dominant allele.

  • In simple dominance, what allele will be expressed?

    Answer: The dominant allele is expressed in simple dominance.

  • If I have a heterozygous pair of alleles, what genotype do I have?

    Answer: I have one dominant allele and one recessive allele.


Great job you have completed part 1 of coat color genetics l.jpg

Great job! You have completed Part 1 of Coat Color Genetics! presentation. Remember to use the “Let’s Review” worksheets as you see what you have learned.

You may test your knowledge with the quiz available at www.apha.com/education.

This presentation has been provided courtesy of the American Paint Horse Association.


ad