Alleles
A) in a chromosome pair are always identical.
B) in a chromosome pair are always different.
C) in a chromosome pair are sometimes identical and sometimes different.
D) occur singly, not in pairs.

Question

Quizplus · Accepted Answer

An individual has two copies of each chromosome (one from each parent), and therefore two copies of each gene. The different forms of a gene are called alleles, and they can be identical or different in the two chromosome copies.