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Prophase II

Down's syndro...

Question

Down's syndrome is due to

A

Non-disjunction of chromosome

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B

Sex-linked inheritance

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C

Crossing over

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D

Linkage

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Solution

The correct option is A
Non-disjunction of chromosome

Down's syndrome is caused by the presence of an extra chromosome no. 21. Both the chromosomes of the pair 21 pass into a single egg due to non-disjunction during oogenesis in the mother’s ovary.

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