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Down's Syndrome

Down's syndro...

Question

Down's syndrome is caused by the presence of extra chromosome number.

A

X

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B

Y

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C

21

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D

22

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Solution

The correct option is D $21$
Down syndrome is caused by having three copies of the genes on chromosome 21, rather than the usual two, resulting in trisomy 21.
So, the correct answer is '21'.

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