Problem: In cattle, the allele producing red coat color (R) is incompletely dominant over the allele (r) for white coat color. Heterozygotes (Rr) are roan colored. Cattle homozygous for a different gene, "short spine" (aa), are deformed and die shortly after birth. Heterozygous carriers (Aa) are completely normal. If a series of matings is conducted between Aa roan animals, what will be the phenotypic ratio:a) at birth?b) several days after birth?

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FREE Expert Solution

This is a series of matings for Aa roan (Rr) cattle. Thus, this is a dihybrid cross problem, AaRr x AaRr.

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Problem Details

In cattle, the allele producing red coat color (R) is incompletely dominant over the allele (r) for white coat color. Heterozygotes (Rr) are roan colored. Cattle homozygous for a different gene, "short spine" (aa), are deformed and die shortly after birth. Heterozygous carriers (Aa) are completely normal. If a series of matings is conducted between Aa roan animals, what will be the phenotypic ratio:

a) at birth?

b) several days after birth?