The Sickle-Cell Gene Is Found in High Frequency in Certain

The sickle-cell gene is found in high frequency in certain African countries mainly along the equator because:

A) the mutation increases the body's ability to regulate heat.
B) the gene can give protection against rickets.
C) it is in response to natural selection.
D) it provides protection against the harmful effect of ultraviolet radiation.
E) the mutation increases the body's ability to carry oxygen.

Correct Answer:

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