If Tom Is Heterozygous for a Specific Gene Pair, Which

Multiple Choice

If Tom is heterozygous for a specific gene pair, which of the following must be true?

A) Tom's two genes in the specific gene pair are both recessive.
B) Tom's two genes in the specific gene pair are the same.
C) Tom's two genes in the specific gene pair are both dominant.
D) Tom's two genes in the specific gene pair are different.