Question

Which example of natural selection is an example of balanced polymorphism?

Options

• Industrial melanism (Peppered moth)

• Sickle-cell anaemia

• DDT resistance in mosquitoes

• Antibiotic resistance in microbes

Answer 1

Sickle-cell anaemia is the example of balanced polymorphism, because heterozygotes survive better in malaria-prone areas. This maintains both alleles in the population instead of allowing one to be eliminated.