Consider a fictional organism called a gizmo that carries two copies of each chromosome like humans do Gizmos may carry two different variants of the a gene. Version A makes gizmos have solid-colored fur, while version a makes gizmos spotted. When examining the A versus a genes and the proteins that they encode, which of the following do we expect?

A. the gene sequences of both A and a are identical, but structures of protein differ.

B. the gene sequences of both A and a are different, but both protein structures are the same

C. the gene sequences of both A and a are identical, and both structures of protein are the same.

D. the gene structures of both A and a are different, and both protein structures differ