NEET Biology question

Mongolian idiocy, due to trisomy of the 21st chromosome, is called

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

Answer: (A)

Solution

"Mongolian idiocy" is the older historical name for Down's syndrome, caused by trisomy of chromosome 21 (an extra copy, giving three instead of two). Turner's syndrome (b) is

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Question ID VK-120217