Sickle cell aneamia is more common in South Africa. This is due to
Sickle cell aneamia is more common in South Africa. This is due to
- A
Change in $\beta$-chain of haemoglobin
- B
More population of house flies
- C
Change in $\alpha$ -chain of haemoglobin
- D
Change in $\gamma$ -chain of haemoglobin
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