Inspite of great disadvantageous nature of sickle cell anemia it has a high frequency in some parts of Africa. It is because of the reason that

Options :
  1. sickle cell anemic is resistant to malaria
  2. in South Africa oxygen concentration is very high
  3. it is a case of genetic drift
  4. all the above
Answer and Explanation :-

Answer: Option 1

Explanation:

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