Question

Coat colors of dogs depend upon the action of at least two genes. At one locus a dominant epistatic inhibitor
of coat color pigment (A) prevents the expression of color alleles at another independently assorting locus
producing white coat color. When the recessive condition exists at the inhibitor locus (aa), the alleles of the
hypostatic locus may be expressed, aaB producing black and aabb producing brown. When dihybrid white
dogs are mated together, determine the phenotypic proportions expected in the progeny.
a. 9 : 7
b. 9: 3:4
C. 12: 3: 1
d. 13 : 3
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Answer 1

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Sorry yarr I cant answer this question because

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Answer 2

Explanation:

The dominant epistasis of A is more important to understand that whenever A occurs, no matter what comes next the coat color will be white, if aa is in recessive state then the B dominant epistasis occurs that will mask the expression of b and will show black colour. Only in aabb case the coat color will be brown.