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Down's syndrome due to trisomy of 21st chromosome is caused by

$\begin{array}{1 1}(A)\;\text{Non-disjunction during egg formation}\\(B)\;\text{Non-disjunction during sperm formation}\\(C)\;\text{Addition of extra chromosome during mitosis of zygote}\\(D)\;\text{Either (A) or (B)}\end{array} $

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Either (A) or (B)
Hence (D) is the correct answer.
answered Jul 14, 2014 by sreemathi.v
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