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Question
Which of these are the possible cause of sickle cell anemia with respect to hemoglobin?
Options:
A .  Defect in β-chain of hemoglobin
B .  Defect in α-chain of hemoglobin
C .  One copy of an abnormal β-globin gene
D .  Two copies of an abnormal β-globin gene
Answer: Option D
Answer: (d).Two copies of an abnormal β-globin gene

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