The greater fitness of individuals who carry one copy of the sickle-cell allele in areas where malaria is common is called

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Heterozygote advantage refers to the situation where individuals who are heterozygous for a particular trait have a higher fitness compared to either homozygous condition. In the case of sickle-cell allele, individuals who carry one copy of the allele have some resistance to malaria, while individuals with two copies develop sickle cell disease. Therefore, the presence of the sickle-cell allele in heterozygous individuals confers a fitness advantage in areas where malaria is common.

The Greater Fitness of Individuals Who Carry One Copy of the Sickle-Cell