The Volcano Is Currently Dormant, but in a Hypothetical Future

question 39

Multiple Choice

The volcano is currently dormant, but in a hypothetical future scenario, satellite cones at the base of Mt. Kilimanjaro spew sulfurous gases and lava, destroying all life located between the base and 6,000 feet above sea level. As a result of this catastrophe, how should the frequency of the sickle-cell allele change in the remnant human population that survives above 6,000 feet, and which phenomenon accounts for this change in allele frequency?

• A) decreases; disruptive selection
• B) increases; genetic drift
• C) decreases; gene flow
• D) increases; nonrandom mating
• E) decreases; bottleneck effect

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