The Human B-Globin Gene Has Two Alleles,H^S and H^A,individuals That

question 9

Multiple Choice

The human b-globin gene has two alleles,H^S and H^A,individuals that are homozygous for H^S have sickle-cell anemia and a lower fitness.Individuals that are heterozygotes (H^SH^A) do not show sickle-cell symptoms and have a resistance to malaria.Individuals that are homozygous for H^A have the highest fitness but are susceptible to malaria.In areas where malaria is prevalent the H^S allele is maintained in the population.Which type of selection is occurring with the b-globin gene?

• A)stabilizing
• B)directional
• C)disruptive
• D)balancing
• E)negative frequency dependent

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