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The situation usually caused by a failure of mother’s twenty-first chromosome pair to separate is known as :

(a) Down’s syndrome
(b) Klinefelter’s syndrome
(c) Turner’s syndrome
(d) Wilson’s syndrome

Anurag Mishra Professor Asked on 3rd February 2016 in Child Development.
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    Answer: (a) Down’s syndrome 

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    Anurag Mishra Professor Answered on 5th February 2016.
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