A dog breeder is trying to have a litter of yellow lab puppies. She has a female black lab, and is unsure whether it will be possible. Other breeders in her area only
have male black labs. Although two genes go into determining coat color, only the
gene at location E is necessary to determine whether pups are black or yellow.
Presence of the dominant allele (E) results in a black coat. The recessive allele (e)
results in the yellow phenotype. Determine the necessary genotypes of both the
breeder's dog, and the donor's dog to ensure at least some of the puppies are
yellow labs. Fill in the punnett square.