In your textbook, the lower frequency of sickle-cell anemia among present-day Americans of West African ancestry as compared to people living in West Africa blacks is attributed to:
A)genetic drift.
B)gene flow.
C)new mutations.
D)none of the above

Question

Quizplus · Accepted Answer

The lower frequency of sickle-cell anemia among present-day Americans of West African ancestry compared to people living in West Africa is attributed to gene flow. Gene flow refers to the movement of individuals and their genes from one population to another. This reduces the frequency of the sickle-cell allele in the American population as some individuals carrying the sickle-cell allele may not have migrated to the U.S., resulting in a lower prevalence. Genetic drift and new mutations may also play a role in changing the frequency of the sickle-cell allele over time, but they are not the primary reason for the observed difference in frequency between the two populations.

In Your Textbook, the Lower Frequency of Sickle-Cell Anemia Among