The coat color in Labrador retrievers is controlled by two sets of alleles. The gene E/e determines whether the fur has pigment or not and is epistatically dominant to the gene B/b, which controls the darkness of pigment when it is there. A breeder crosses a purebred black Lab with the genotype BBEE and a purebred yellow Lab with the genotype bbee, producing offspring that are black. A test cross is done between these offspring and an individual with the genotype bbee. What is the expected ratio of black:chocolate:yellow?
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The coat color in Labrador retrievers is controlled by two sets of alleles. The gene E/e determines...
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