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 of the heterozygous form over the homozygous forms
C) nonrandom mating
D) a decline in the occurrence of malaria in Africa
E) genetic drift

Question

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 of the heterozygous form over the homozygous forms
C) ​nonrandom mating
D) ​a decline in the occurrence of malaria in Africa
E) ​genetic drift

Quizplus · Accepted Answer

The heterozygous form of sickle-cell anemia (Ss) provides resistance to malaria, which is prevalent in many African populations. This advantage of the heterozygous form results in the persistence of the sickle-cell anemia allele in the population.

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