A couple with a 4-year-old daughter who has cystic fibrosis (CF), and both are CFTR gene carriers, want to try for another baby. What is the likelihood of having a second baby with cystic fibrosis?
A. There is a 25% chance of cystic fibrosis (CF) in the child.
B. 0% chance of CF in the child.
C. There is a 50% chance of being a carrier.
D. There is a 75% chance of cystic fibrosis (CF) in the child.
E. There is a 50% chance of cystic fibrosis (CF) in the child.
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