Which of the following chromosome shows trisomy in case of Down's syndrome?

16th

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9th

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21st

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23rd

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Solution

The correct option is C 21st
Trisomy of the 21st chromosome results in Down's syndrome. Affected individual will have distinct facial appearance, intellectual disability and developmental delays, growth failure, congenital heart disease, etc.

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Down Syndrome is caused by trisomy of chromosome 21. True or false?

^{s}

^{t}

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