The Persistence of the Sickle-Cell Anemia Allele in the African

question 24

Multiple Choice

The persistence of the sickle-cell anemia allele in the African population is the result of

• A) a high rate of mutation of the normal allele to the sickle-cell anemia allele.
• B) the advantage of the heterozygous form over the homozygous forms.
• C) nonrandom mating.
• D) a decline in the occurrence of malaria in Africa.
• E) genetic drift.

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