Suppose that pigmentation of a Labrador retriever's fur is subject to epistasis of the B alleles by the e alleles. B (black) is dominant over b (chocolate brown). E is dominant over e. Homozygous e is epistatic to the black and chocolate-brown genes. Given this information, what will result from a F1 dihybrid cross between two dogs?
a. 9/16 black, 6/16 brown, 1/16 yellow
b. 9/16 yellow, 3/16 brown, 4/16 black
c. 9/16 yellow, 6/16 brown, 1/16 black
d. 9/16 black, 3/16 brown, 4/16 yellow
Ans: d. 9/16 black, 3/16 brown, 4/16 yellow
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