The Disease,sickle-Cell Anemia Is Common in Malaria-Infested Areas Because Individuals

The disease,sickle-cell anemia is common in malaria-infested areas because individuals that are heterozygous for the gene (AS) have enhanced resistance to malaria over normal individuals (AA) .Individuals with severe sickle-cell anemia (SS) usually die before reproduction.Assume that a population under Hardy-Weinberg equilibrium has allele frequencies of A = 0.8 and S = 0.2.Assume that this population is then subject to the following selection forces:
AA: 15% die of malaria
AS: 5% die of malaria
SS: 100% die of severe sickle-cell anemia
What will be the frequency of the S allele after selection occurs?

A) 0.0
B) 0.04
C) 0.15
D) 0.18
E) 0.3

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