We continue to see sickle-cell anemia in certain populations because the presence of one recessive gene for sickle-cell anemia

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The presence of one recessive gene for sickle-cell anemia provides the individual with some level of protection from malaria. Malaria is endemic in many areas of Africa where the sickle-cell allele is common. Individuals who carry one sickle-cell allele are less likely to contract severe forms of malaria, which can be life-threatening. Therefore, carriers of the sickle-cell allele are more likely to survive and pass on the allele to their offspring. As a result, sickle-cell anemia remains prevalent in populations where malaria is common.

We Continue to See Sickle-Cell Anemia in Certain Populations Because