The Study of Sickle-Cell Anemia and Its Relation to Malarial

The study of sickle-cell anemia and its relation to malarial environments demonstrates that

A) homozygotes lack the capacity to digest lactose.
B) a maladaptive allele may be preserved if it provides an advantage.
C) natural selection improves a gene pool by wiping out deleterious alleles.
D) selection removes recessive alleles from the gene pool faster than it does dominant alleles.
E) heterozygotes are not as selectively fit as are dominant homozygotes.

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