The frequency of the sickle cell allele in areas where malaria is introduced will increase and it will be advantageous.
When a person is heterozygous for sickle cell anemia, it means it has one abnormal allele of the hemoglobin beta gene but doesn’t express the disease (like homozygous person).
On the other hand, a person heterozygotes for sickle-cell trait has a selective advantage in environments where malaria is present.
I think the answer is B
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Diffusion refers to the random motion of particles from a medium of higher concentration to a medium of lower concentration.
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Anemia is the condition describing either a decrease in the number of red blood cells or the hemoglobin within the red blood cells
