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

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.