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Coat Colors in Labrador Retrievers
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Description
Epistasis in dogs. Epistatic interactions among products of two gene pairs affect coat color in Laborador retrievers. All dogs with an E and B allele have black fur. Those with an E and two recessive b alleles have brown fur. All dogs homozygous for the recessive e allele have yellow fur.

Epistasis
Two or more gene products influence a trait
Typically, one gene product suppresses the effect of another

Example: Coat color in dogs
Alleles B and b designate colors (black or brown)
Two recessive alleles ee suppress color

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