The HbS allele increased in frequency in West African populations due to
a. sickle-cell anemia.
b. genetic drift.
c. migration.
d. increased mutation rates.
e. natural selection.
E
You might also like to view...
In 1900, important differences among red blood cells were discovered by:
A. Gregor Mendel B. Karl Landsteiner C. James Watson D. Francis Galton
Which of the following is not commonly associated with historical linguistics?
a. ?Grouping languages into families b. ?Analysis of how a language is currently used c. Comparative study of languages d. Identification of similarities and differences between languages
Many Africans converted to __________ to increase opportunities to engage in trade.
A) Islam B) Judaism C) Buddhism D) Hinduism
In most societies, someone who sees ghosts would most likely say they are visited by __________.
A) close relatives B) unknown strangers C) distant relatives D) known animals