Multiple Choice
A phenotypically normal man has phenotypically normal parents but he has a sister who has cystic fibrosis caused by a recessive mutant allele. What is the probability that the man is heterozygous for the cystic fibrosis allele?
A) 1/4
B) 1/2
C) 3/4
D) 2/3
E) 1/3
Correct Answer:
Verified
Correct Answer:
Verified
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