Carriers of the sickle cell gene __________

A) often do not display symptoms until after they have passed the gene on to their children
B) can be treated during infancy if placed on a diet that is low in phenylalanine
C) are more resistant to malaria than are individuals with two alleles for normal red blood cells
D) develop sickle-shaped red blood cells that cause degeneration of the nervous systems

Answer: C