Why is coat color in Labrador retrievers an example of epistasis?
What will be an ideal response?
Coat color is primarily due to the interaction of two genes. The E gene determines if dark pigment will be deposited in fur or not. If a dog has the genotype ee, no pigment will be deposited in the fur, and it will be yellow. If a dog has the genotype E_, pigment will be deposited in the fur. A second gene, the B gene, determines how dark the pigment will be. Dogs with the genotype E_B_ are black labs with black fur. However, even in yellow dogs the B gene does have some effect. Yellow dogs with the genotype eebb will have brown pigment on their nose, lips, and eye rims, while yellow dogs with the genotype eeB_ will have black pigment in these areas.
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Fill in the blank(s) with correct word