Multiple choice

Sickle cell anemia has not been eliminated from the African population because

  1. it is not a fatal disease

  2. it provides adaptiveness against malaria

  3. it is controlled by dominant genes

  4. it is controlled by recessive genes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sickle cell trait provides a survival advantage against malaria in heterozygous individuals. This balanced polymorphism keeps the sickle cell gene in the population despite the lethality of the homozygous condition.

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