Carriers of the Sickle Cell Allele

Multiple Choice

Carriers of the sickle cell allele

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.