NEET Biology question

Name the syndrome which is caused when there is trisomy of the sex chromosomes.

(A)Turner's syndrome
(B)Down's syndrome
(C)Klinefelter's syndromeCorrect
(D)Patau's syndrome

Answer: (C)

Solution

Klinefelter's syndrome (karyotype 47,XXY) is specifically a trisomy involving the sex chromosomes (an extra X alongside a normal XY). Turner's syndrome (a) is a sex-chromosome *monosomy* (45,X), not a trisomy;

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Question ID VK-120428