A) Turner's syndrome
B) Ktinefelter's syndrome
C) Down's syndrome
D) Haemophilia and colour blindness
Correct Answer: C
Solution :
Down's syndrome or Mongolian idiocy is not related to sex chromosome X or Y. It is due to the Ist trisomy of 21st chromosome, ie, total 47 chromosomes. The main features are mental deficiency, short stature, round face, flaccid muscles, small ears, protruding tongue and epithelial folds over the eyes (to give Mongolian look).
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