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Down's Syndrome

Down's syndro...

Question

Down's syndrome/ mongolism is due to

A

Extra sex chromosome

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B

Extra

21

st chromosome

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C

Extra Y-chromosome

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D

Deficient sex chromosome

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Solution

The correct option is B Extra $21$ st chromosome
Down syndrome also known as trisomy 21, is a genetic disorder caused by the presence of all or part of the third copy of chromosome 21.
So, the correct answer is 'Extra 21st chromosome'.

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