5. Labrador retriever dogs have two genes that affect coat color. One gene, the

Question

5. Labrador retriever dogs have two genes that affect coat color. One gene, the R locus, codes for the intensity of eumelanin production in the dog?s coat. It has two alleles that produce either a black pigment (B) or a brown pigment (h). Another gene, the E gene, is epistatic to the B gene. The dominant E allele causes eumelanin to be deposited along the length of the dog?s hair shafts. The recessive e allele blocks the deposition of eumelanin in the hair, so only the yellow producing phaeomelanin pigment is deposited, resulting in yellow dogs. If you cross parents with the following genotypes, BbEe x bbEe, what phenotypic ratio do you expect in their offspring?

Explanation / Answer

Cross the BbEe X bbEe

So, the expected phenotypic ratio is 3:1:3:1

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