Labrador retrievers have black,brown,or yellow fur.Fur color is controlled by two genes,one of which exhibits epistasis.Black (B)is dominant over brown (b)in one gene,and (E)is dominant over (e)in the other gene.The (E)gene is epistatic to the (B)gene.In a cross of a black female with a brown male,results can be all black puppies,1/2 black to 1/2 brown puppies,or 3/4 black to 1/4 yellow puppies.In one cross of black × black,the results were as follows:9/16 black,4/16 yellow,3/16 brown.
The genotype eebb must result in which of the following?

Question

Quizplus · Accepted Answer

The genotype eebb indicates that the dog has two recessive alleles for both genes. This means that regardless of the B allele, the fur color will be determined by the e allele. The e allele is recessive to E, so a dog with the genotype eebb will always have yellow fur.

Labrador Retrievers Have Black,brown,or Yellow Fur