Match List-I with List-II

List I	List II
A. Tay-Sachs disorder	I. The 23rd pair is actually missing an X
B. Down's syndrome	II. Fatal neurological disorder
C. Klinefelter's syndrome	III. An extra chromosome in what would normally be the 21st pair
D. Turner's syndrome	IV. The 23rd set of sex chromosomes is XXY

1. AA-III, B-IV, C-II, D-I
2. BA-II, B-III, C-IV, D-I
3. CA-IV, B-I, C-III, D-II
4. DA-I, B-III, C-II, D-IV

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

Explanation

Tay-Sachs – fatal neurological disorder; Down's – extra chromosome 21; Klinefelter's – XXY; Turner's – one X missing (XO).