Apentix/AP Biology/Unit 5: Heredity/Question

AP Biologyhardmcq1 pt

In Labrador retrievers, coat color is determined by two genes. The B gene controls pigment color (B = black, b = brown), while the E gene controls pigment deposition. If a dog is homozygous recessive for the E gene (ee), the coat is yellow regardless of the B gene's alleles. What is the genetic phenomenon described here?

Explanation

Core Concept

Epistasis is defined as a phenomenon where the expression of one gene is completely masked or modified by the expression of one or more other genes. Here, the E gene is epistatic to the B gene because the recessive 'ee' genotype masks the expression of coat color.

Correct Answer

q5_B

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