A) 15th
B) 21th
C) 20th
D) 19th
Correct Answer: B
Solution :
The Downs syndrome (Mongolian idiocy) arises due to trisomy of 21st chromosome i.e., total 47 chromosomes will be present in such person. The main features are mental deficiency, short stature, round face, flaccid muscles, protruding tongue etc.
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