Men with Klinefelter syndrome do not show barr body because

They can inactivate extra copy of chromosome

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They cannot activate the extra copy of chromosome

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They have linked genes

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All of the above

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Solution

The correct option is A They can inactivate extra copy of chromosome
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. Men with Klinefelter syndrome (47, XXY ) have a single Barr body but it is not seen because that extra copy of X chromosome is inactivated.

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Similar questions

Choose the correct option:

Assertion [A]: Patients having Klinefelter syndrome have higher amounts of estrogen in the body.
Reason [R]: Klinefelter syndrome occurs due to appearance of an extra X chromosome in the human males.

Choose the correct option regarding the Assertion and Reason:

Assertion [A]: Patients having Klinefelter syndrome have higher amounts of estrogen in the body.
Reason [R]: Klinefelter syndrome occurs due to appearance of an extra X chromosome in the human males.

Q. A person suffering from Klinefelter syndrome will have how many barr bodies?

Q. A mother is afflicted by Down's syndrome caused by an extra copy of chromosome

21

. Father is normal. Percentage of offspring affected by the disorder would be

Q. Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offsprings produced by an affected mother and a normal father would be affected by this disorder?

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