[IB Biology SL at GHS: Natural Selection Review #1]

15. People who are heterozygous for the sickle cell allele __?__

A) are less susceptible to malaria than people who lack the allele.

B) have an advantage for survival if they live in malaria infested areas.

C) are healthy.

D) All of the above are true.

E) None of the above are true.

-------- [Answer] --------

Slichter