Considering the Overall Human Population of the U

question 17

Multiple Choice

Considering the overall human population of the U.S. mainland at the time when the slave trade brought large numbers of people from equatorial Africa, what was primarily acting to change the frequency of the sickle-cell allele in the overall U.S. population?

• A) natural selection
• B) gene flow
• C) genetic drift
• D) founder effect
• E) Two of the responses are correct.