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The population in South Africa is more prone to sickle cell anemia (genotype “ss”). People with genotype “ss” survive only up to 14-15 years of age. People with “SS” are prone to malaria because the parasite resides inside their RBCs. People with genotype "Ss" are resistant to malaria because the parasite cannot reside inside their RBCs, and they can live a normal life (without sickle cell anemia). What kind of evolutionary force must be operative in South Africa? A. Stabilizing selection B. Directional selection C. Disruptive selection

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Greenleafable

The kind of evolutionary force which must be operative in South Africa is A. stabilizing selection.
That is a type of natural selection in which genetic diversity decreases as the population stabilizes on a particular trait value. So you can see that these people with Ss genotype are a sort of stabilization of the previous two groups.

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