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 is attributed to
A) genetic drift.
B) gene flow.
C) new mutations.
D) natural selection.

Question

Quizplus · Accepted Answer

Gene flow occurs when individuals from different populations interbreed, leading to a mixing of genetic traits. In this case, the lower frequency of sickle-cell anemia among Americans of West African ancestry compared to those in West Africa is likely due to gene flow with other populations, reducing the prevalence of the sickle-cell trait.

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