In the United States,the Parasite That Causes Malaria Is Not

In the United States,the parasite that causes malaria is not present,but African Americans whose ancestors were from equatorial Africa are present.What should be happening to the sickle-cell allele in the United States,and what should be happening to it in equatorial Africa?

A) stabilizing selection;disruptive selection
B) disruptive selection;stabilizing selection
C) disruptive selection;directional selection
D) directional selection;disruptive selection

Correct Answer:

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