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Q.The number of chromosomes in the individual suffering from Klinefelter's syndrome is :

(a)
(i) 48
(b)
(ii) 47
(c)
(iii) 46
(d)
(iv) 45
Uttarakhand UbseUttarakhand Board Intermediate (Class 12) 2018MCQ· 1mImportance★★★★★
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A person with Klinefelter's syndrome has 47 chromosomes — option (ii) — because of an additional X chromosome (44 autosomes+XXY44\text{ autosomes} + XXY).

Concept

The normal human diploid number is 2n=462n = 46 (4444 autosomes +2+ 2 sex chromosomes). Klinefelter's syndrome is caused by non-disjunction during gamete formation, which leaves the individual with one extra X chromosome.

Why

  • Sex-chromosome constitution: XXY instead of XY.
  • Total count: 44+XXY=4744 + \text{XXY} = 47.
  • The individual is phenotypically male but shows feminised features — gynaecomastia (breast development), sparse body hair, and usually sterility.

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