In your textbook, the lesser frequency of sickle-cell anemia among present day American blacks as compared to West African blacks is attributed to
A)genetic drift.
B)gene flow.
C)new mutations.
D)none of the above.

Question

Quizplus · Accepted Answer

The lesser frequency of sickle-cell anemia among present day American blacks as compared to West African blacks is attributed to gene flow. Gene flow, which is the movement of genes from one population to another, can dilute or reduce the frequency of a particular allele in a population. In the case of sickle-cell anemia, it is believed that the allele for sickle-cell anemia was brought to the Americas through the slave trade. As a result of gene flow, the frequency of the sickle-cell allele decreased among American blacks over time. This is why sickle-cell anemia is less common in this population compared to West African blacks.

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