In cattle, coats may be solid white, solid black, or black-and-white spotted. When true-breeding solid whites are mated with true-breeding solid blacks, the F1 generation consists of all solid white individuals. After many F1×F1 matings, the following ratio was observed in the F2 generation: 12/16 solid white 3/16 black-and-white spotted 1/16 solid black Part A How many gene pairs are involved in the inheritance of cattle coat color?

Two locus

Explanation:

Let assume  the gene for white (1st locus) be W i.e. ww = recessive

here, Let the alleles for the 2nd locus be B and b.

White: W_B_, W_bb

Black&White: wwB_

Black: wwbb

This is dominant epistasis. In dominant epistasis, where the dominant allele of the 1st locus (W) masks or hide the expression of the 2nd locus. When the two alleles in the 1st locus are recessive (ww), the alleles in the 2nd locus can be expressed(B and b).

explanation:

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