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
Question 2
Which statement is supported by research on dominant and recessive diseases?
A) Children who inherit the dominant allele rarely develop the disorder.
B) Males are more likely than females to inherit recessive disorders carried on the autosomes.
C) Only rarely are serious diseases due to dominant alleles.
D) The recessive allele has no effect on the individuals characteristics.
