You have a female Labrador retriever. This breed has three coat colors, black, c

Question

You have a female Labrador retriever. This breed has three coat colors, black, chocolate, and yellow. Black labs are dark as night, chocolate labs are a deep brown, and yellow labs appear light brown to white. Their nose, lips and gums can be either brown or black. Your dog is yellow with a black nose. You breed her with a chocolate lab with a brown nose. All puppies are either black or yellow and have a black nose. Coat color is due to an epistatic interaction between a gene that determines chocolate or black pigment color (designated B) and a gene that is involved in pigment deposition (designated E). Each gene has a recessive allele that does not function. Black labs are B_/E_; chocolate labs are bb/E_; and yellow labs are __/ee. The “E” gene does not appear to be involved in the deposition of pigment to the nose and gums.

***what is most likely genotype of your dog

Explanation / Answer

Black labs are dark and have genotype = Bb/Ee

Chocolate labs are brown and have genotype = bb/Ee

Yellow lab with balck nose have genotype = Yy/ee

The chocolate or black pigment is designated B or b and yellow pigment is designated as Y. The pigment deposition gene E and it exhibits epistatic interaction with pigment determining genes B or b or Y.

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