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

question 27

Multiple Choice

The persistence of the sickle-cell anemia allele in some African populations is the result of ____.  

• A) a high rate of mutation of the normal allele to the sickle-cell anemia allele
• B) the advantage conferred by the heterozygous form when malaria is prevalent
• C) nonrandom mating
• D) a decline in the occurrence of malaria in Africa
• E) genetic drift

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