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A Barr body represents an inactivated X chromosome in the somatic cells of females. If additional X chromosomes are present, will there be a corresponding increase in the number of Barr bodies?

1. True
2. False
3. Cannot be determined
4. None of these

Correct answer: True

Solution

A Barr body is an inactivated X chromosome in females. The number of Barr bodies is equal to the total number of X chromosomes minus one. Thus, if there are more X chromosomes, there will indeed be more Barr bodies.

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