A) linkage
B) sex-linked inheritance
C) crossing over
D) non-disjunction of chromosome
Correct Answer: D
Solution :
Downs syndrome or Mongolian idiocy is due to trisomy of 21 chromosome. It is caused by son-disjunction of 21st chromosome pair during anaphase-I. This syndrome is characterised by rounded face with broad fore-head, open mouth with protruding tongue and projecting lower lip, small flat hands with stubby little finger, mentally retarded and underdeveloped gonads and genitals.
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