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In Down syndrome , karyotyping has shown...

In Down syndrome , karyotyping has shown that the disoeder is associated with trisomy of chromosome number 21 usually due to:

A

Non-disjuction during egg-cell formation

B

Non-disjuction during sperm-cell formation

C

Non-disjunction during formation of egg-cell or sperm-cells

D

Addition of extra chromosome during mitosis of the zygote

Text Solution

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The correct Answer is:
C
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