Q. Sickle cell anaemia has not been eliminated from the African population because :
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
Explanation
[Solution from source] Heterozygous carriers (HbA HbS) are more resistant to falciparum malaria, so the allele is kept in high frequency where malaria is common. Simply being recessive does not explain why the allele persists at such a high frequency. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.