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.
Answer: b
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