In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?," if two carriers of the defective CFTR gene have a child,what is the probability that the child will have cystic fibrosis?

Question

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When two carriers of the defective CFTR gene have a child, there is a 25% chance the child will inherit two defective genes and have cystic fibrosis.

In the Section "Investigating Life: Does Natural Selection Maintain Cystic