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

question 32

Multiple Choice

In the section "Investigating Life: Does Natural Selection Maintain Cystic Fibrosis?," 1 in 25 Caucasians is a carrier for the defective CFTR gene,making it the most common genetic disease in this population.Why are the frequency of defects in CFTR so common in caucasians?

• 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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Definitions:

Credits

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An accounting system in which every transaction is recorded in at least two accounts, ensuring the accounting equation remains balanced.

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A record in accounting that represents every single transaction made by a company, detailing the financial activities.

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Entries on the left side of a double-entry bookkeeping system that increase asset or expense accounts, or decrease liability, equity, or revenue accounts.