Question
A person who is trisomic for twenty first pair of chromosome suffers from
Klinefelter's syndrome
Down's syndrome
Turner's syndrome
None of the above
Solution
B.
Down's syndrome
Down's syndrome(45 + XXor45 + XY) is the case when there is one extra chromosome in 21st pair of autosome. It is also called trisomy 21 or trisomy-G. It is most common in children of over aged mothers (above 41 years). It is also called Mongolian syndrome.
