Question

8. Imagine that coat color in dogs is determined by two genes, each of which has two alleles:

The dominant P allele of the pigment gene allows the dog to produce black pigment, while the recessive p allele is a null allele that does not produce any pigment.

The dominant T allele of the transporter gene makes a transporter protein that transports the pigment into the hair cells, while the recessive t allele is a null allele that does not produce the transport protein (unpigmented hair is grey).

If you perform a dihybrid cross focused on the phenotypic effects of these two genes, what ratio of phenotypes do you expect in the F2 generation?

Please provide an explanation.

Answer 1