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

question 33

Multiple Choice

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.