Which of the following method renders the inactivation of X chromosome to form the barr body?

lyonization

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Synapsis

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Crossing over

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None of the above

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Solution

The correct option is A lyonization
During embryonic development, female inactivates one of the X chromosomes because if both the X chromosomes are genetically expressed simultaneously, then double the necessary genetic products will be made. This inactivated X chromosome is called a Barr body and the process of inactivation is called lyonization. Thus the correct answer is option A.

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