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      Question

      Extra number of which chromosome is responsible for

      Down’s syndrome (Mongoloid Idiot) in man.
      A Chromosome No. 21 Correct Answer Incorrect Answer
      B X-Chromosome Correct Answer Incorrect Answer
      C Y – Chromosome Correct Answer Incorrect Answer
      D 15 + X chromosome Correct Answer Incorrect Answer

      Solution

      Down syndrome is a complex set of pathologies caused by an extra copy of human chromosome 21 (Hsa21).

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