Match List I with List II : List I List II A. Down's syndrome I. 11^ th chromosome B. α-Thalassemia II. 'X' chromosome C. β-Thalassemia III. 21^ st chromosome D. Klinefelter's syndrome IV. 16^ th chromosome Choose the

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Correct answer: B. A-III, B-IV, C-I, D-II

Down's syndrome is due to presence of an additional copy of chromosome number 21. Klinefelter's syndrome is caused due to presence of an additional copy of X-chromosome. α -Thalassemia is controlled by two closely linked genes on chromosome 16 of each parent. β -Thalassemia is controlled by a single gene HBB on chromosome 11 of each parent.

Match List I with List II : List I List II A. Down's syndrome I....

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More from Principles of Inheritance and Variation

	List I		List II
A.	Down's syndrome	I.	11^{th } chromosome
B.	\alpha-Thalassemia	II.	'X' chromosome
C.	\beta-Thalassemia	III.	21^{st } chromosome
D.	Klinefelter's syndrome	IV.	16^{th } chromosome