Your Dog, Socks, Is a Terrier with Short Black Hair

Your dog, Socks, is a terrier with short black hair. When you pick him up, you notice that Socks does not have hair on the bottom of his paws; rather, he has sharp claws. Which statement below best explains the difference between the cells that produce Socks's hair from those that produce his claws?

A) Because these two cells are completely different, they have completely different genomes; therefore, they make different proteins.
B) Both cell types contain the entire genome, but certain cells will express only certain genes.
C) The cells that produce the hair do not have the chromosomes that carry the claw genes, and the cells that produce the claws do not have the chromosomes that carry the hair genes.
D) The cells that produce Socks's hair contain only the genes necessary for hair production. Likewise, the cells that produce Socks's claws contain only the genes necessary for producing claws.
E) Socks's claws are produced from a mutation in the hair gene that produces hair in all other cells on Socks's skin.