Lecture 9: set - 2 Coat Color Genetics

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Last updated 5:29 PM on 10/18/26
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30 Terms

1
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What does the extension gene (E) determine?
Whether the base coat color is red or black.
2
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What genotype produces a red, sorrel, or chestnut horse?
ee.
3
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What genotypes produce a black base coat?
EE or Ee.
4
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What does the agouti gene (A) determine?
Whether black pigment covers the whole body or is restricted to the extremities.
5
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What is the genotype for a black horse under the agouti gene?
aa.
6
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What genotypes produce bay under the agouti gene?
AA or Aa.
7
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What agouti genotypes can red horses have?
AA, Aa, or aa; agouti is not expressed with ee.
8
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Why is the agouti gene not visibly expressed in red horses?
The ee genotype prevents the black pigment pattern from showing.
9
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What does the cream dilution gene (C) do?
Reduces pigmentation and lightens the base coat color.
10
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Which cream allele is dominant according to the lecture?
Ccr.
11
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What does one cream dilution do to a red base coat?
Changes it to yellow.
12
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What does one cream dilution do to a bay horse?
Produces a buckskin.
13
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What does one cream dilution do to a black base coat?
Produces a smoky/smokey black; black areas are less affected.
14
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What does two cream dilutions do to a bay horse?
Produces a perlino.
15
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What does two cream dilutions do to a red horse?
Produces a cremello.
16
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What does one cream dilution do to a red horse?
Produces a palomino.
17
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What are the four cream dilution results to memorize?
Bay + 1 = buckskin; bay + 2 = perlino; red + 1 = palomino; red + 2 = cremello.
18
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What type of inheritance does the cream gene show?
Incomplete dominance.
19
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What does the dun gene (D) do?
A dominant D allele dilutes the base coat color; d does not.
20
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What is a grullo?
A dun-diluted horse with a black base color.
21
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What is a bay dun?
A dun-diluted horse with a bay base color.
22
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What is a red dun?
A dun-diluted horse with a red base color.
23
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What does the roan allele (Rn) do?
Creates a mixture of about 50% white hairs and 50% base-color hairs.
24
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What does the rn allele do?
Does not affect coat color.
25
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What is a blue roan?
A roan horse with a black base color (EE or Ee).
26
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What is a red roan?
A roan horse with a red base color (ee).
27
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What does the grey gene (G) do?
A dominant G masks other coat-color genes.
28
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What does the g allele do?
Allows regular coat-color genes to show.
29
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How does a grey horse change as it ages?
It is born dark or solid and gradually becomes lighter.
30
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What must be true about a grey horse's parents?
At least one parent must be grey, according to the lecture.