A) Klinefelters syndrome
B) Downs syndrome
C) Turners syndrome
D) None of these
Correct Answer: B
Solution :
Downs syndrome (45 + XX or 45 + XY) is the case when there is one extra chromosome in 21st pair of outosome. 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.
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