A) it is controlled by recessive genes
B) it is not a fatal disease
C) it provides immunity against malaria
D) it is controlled by dominant genes
Correct Answer: B
Solution :
Sickle-cell aneamia (in which RBCs become sickle-shaped and stiff) is a genetic disorder that is autosomal and linked to a recessive allele. It has not been eliminated from the African population because it provides immunity against malaria. People who are heterozygous for sickle-cell allelic arc much less susceptible for falciparum malaria/which is one of the main causes of illness and death in them. Thus, the sickle-cell allele is maintained at high levels in populations where falciparum malaria is common.
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