Two genes control fur color in Labrador retrievers.The first gene determines whether the pigment to be deposited in the hairs will be black or brown.The second gene determines whether the pigments are put into the dog's hairs at all.A dog homozygous for the recessive allele of this second gene will be yellow because no pigment is deposited in its hairs.This is an example of

Question

Quizplus · Accepted Answer

This is an example of epistasis because the expression of the second gene masks the expression of the first gene. The presence of the recessive allele of the second gene results in the absence of pigment regardless of the genotype of the first gene.

Two Genes Control Fur Color in Labrador Retrievers