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

question 50

Multiple Choice

In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?," those with the genetic mutation in the protein are resistant to cholera infections.What did the scientists hypothesize about the relationship between cystic fibrosis and cholera resistance?

• A) Carriers with one copy of the defective CFTR gene have decreased resistance to cholera compared to those with no defective copies.
• B) These individuals were exposed to cholera, causing mutations in their CFTR gene that can then be passed on to their children.
• C) Carriers will be more likely to have children who develop cystic fibrosis.
• D) Carriers with one copy of the defective CFTR gene have increased resistance to cholera compared to those with no defective copies.
• E) Only carriers would be able to survive exposure to cholera.

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