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The number of Barr bodies present in a female child with Down Syndrome is

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zero

one

two

three

answer is B.

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Detailed Solution

Someone with two X chromosomes (such as most human females) has only one Barr body per somatic cell, while someone with one X chromosome (such as most human males) has none.

A female suffering from Down's has an extra copy of 21^st autosome and XX sex chromosomes.

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