Cystic fibrosis (CF) is caused by a recessive allele. A child has CF, even though neither of his parents has CF. This couple also has a child who does not have CF. What is the probability the unaffected child is heterozygous?

A) 1/4 B) 1/3 C) 2/3 D) 1/2 E) 3/4


Answer: D

Biology & Microbiology

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