Resistance of sickle cell disease carriers to malaria illustrates

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The resistance of sickle cell disease carriers to malaria illustrates balanced polymorphism, which is the maintenance of two or more alleles in a population due to natural selection. In this case, carriers of the sickle cell allele have an advantage in regions where malaria is common, as they are less likely to die from the disease. As a result, the sickle cell allele persists in the population, even though it can cause sickle cell disease in homozygotes.

Resistance of Sickle Cell Disease Carriers to Malaria Illustrates