Question

if someone is a carrier of a recessive genetic disorder, it means he or she has ______ of the allele, and ______ exhibit symptoms of the disorder.
○ two copies; does
○ one copy; does not
○ zero copies; does not
○ two copies; does not
○ one copy; does

Explanation:

A carrier of a recessive genetic disorder has one copy of the recessive allele. Since the disorder is recessive, having only one copy means the dominant allele masks it, so the carrier does not exhibit symptoms.

Answer:

B. one copy; does not