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9.	Which of these are the possible cause of sickle cell anemia with respect to hemoglobin?
	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


	Explanation:
	If a person has one copy of abnormal β-globin gene it will show sickle cell trait but not sickle cell anemia while an individual with sickle cell anemia has both the copies of an abnormal β-globin gene.



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Published by:Michael Daani

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