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

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In Labrador retrievers, the E allele allows the expression of the B or b alleles, while the homozygous recessive ee genotype results in yellow fur regardless of the B or b alleles. In a dihybrid cross, the expected phenotypic ratio is 9/16 black (B_E_), 3/16 brown (bbE_), and 4/16 yellow (B_ee or bbee).

Suppose That Pigmentation of a Labrador Retriever's Fur Is Subject