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Question: mutations in the cftr gene cause cystic fibrosis cf the...

Question details
Mutations in the CFTR gene cause cystic fibrosis (CF). The normal allege is dominant to the mutant allele. Two people who are heterozygous decide to have children. If they have three children, what is the probability that they will have the following phenotypes?
A. All children without CF
B. Either all with CF or all without CF
C. One child with CF and two without CF
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