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Radda [10]
3 years ago
13

In the United States, the parasite that causes malaria is not present, but African-Americans whose ancestors were from equatoria

l 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?
Social Studies
1 answer:
lakkis [162]3 years ago
3 0

Answer:

Directional selection; stabilizing selection

Explanation:

  • The stabilizing selection is a result of the decrease of the population and causes genetic variation due to the natural selection.  
  • The directional selection of the genetic variation shifts to a new phenotype and on exposure to the environmental changes and both of these can lead to the natural selection and contribute to the variation of the population.
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