The Palomino horse is a hybrid exhibiting a golden color with lighter mane and t

Question

The Palomino horse is a hybrid exhibiting a golden color with lighter mane and tail. A pair of codominant alleles (D^1 and D^2) is known to be involved in the inheritance of these coat colors. Genotypes homozygous for the D^1 allele are chestnut-colored (reddish), heterozygous genotypes are Palomino-colored, and genotypes homozygous for the D^2 allele are almost white and called cremello. (a) From matings between Palominos, determine the expected Palomino: non-Palomino ratio among the offspring. (b) What percentage of the non-Palomino offspring in part (a) will breed true? (c) What kind of mating will produce only Palominos?

Explanation / Answer

1. In codominant, both the alleles of a gene express themselves in heterozygotes. As a result, heterozygotes for such genes possess the phenotypes produced by both the alleles of such genes.

2. From the above information Genetypes homozygous for (D1D1) will produce chestnut-coloured (reddish),homozygous for (D2D2) will produce cremello (white), heterozygous genotypes (D1D2)will produce Palomino-coloured.

3. Mating between heterozygous Palominos will produce 50% Palominos and 50% Non-Palominos.

Parents Palominos male Palominos female

Genotype D1D2 D1D2

Gametes D1 D2 D1 D2

The genotypic ratio is 1:2:1 that is Chestunt coloour (D!D!):Palomino colour (D1D2): White colour (D2D2)

4. Mating between between chestunt colour and White colour will produce all heterozygous Palomino coloured horses,

5. Self fertilization between Palominoes will also produce 50% Palominoes

5. Test cross and Back cross will also produce 50% Palominoes.

D1 D2 D1 D1D! D1D2 D2 D1D2 D1D2

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