Sickle-cell anaemia is kept in the population due to:

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Sickle-cell anaemia is caused by a mutation in the hemoglobin gene, resulting in abnormal hemoglobin molecules that can cause the characteristic sickle-shaped red blood cells. However, individuals who carry one copy of the mutated gene (heterozygotes) have a survival advantage in areas where malaria is prevalent, as the sickle-shaped cells can help prevent the malaria parasite from infecting them. This is known as heterozygous advantage – the survival advantage of having one copy of the mutated gene in a population where certain environmental pressures exist. As a result, the sickle-cell allele is kept in the population even though homozygotes (those with two copies of the mutated gene) suffer from sickle cell anaemia.

Sickle-Cell Anaemia Is Kept in the Population Due To