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

Question

Quizplus · Accepted Answer

If Tom is heterozygous for a specific gene pair, it means he has two different alleles for that gene. Therefore, option C is the correct choice. Option A cannot be true because if both genes were dominant, Tom would be homozygous dominant, not heterozygous. Likewise, option B cannot be true for the same reason. Option D cannot be true because if the two genes were the same, Tom would be homozygous, not heterozygous.

If Tom Is Heterozygous for a Specific Gene Pair, Which