Assertion [A]: Klinefelter syndrome occurs only in males.

Reason [R]: Klinefelter syndrome is characterised by an additional Y chromosome in the karyotype.

A is true and R is false

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R is true and A is false

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Both A and R are true and R is the correct explanation for A

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Both A and R are true but R is not the correct explanation for A

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Solution

The correct option is A A is true and R is false

Klinefelter's syndrome is caused due to the presence of an additional X chromosome in the karyotype of males.

This results in 44 autosomes + XXY allosomes (totally, 47 chromosomes).

Such men are sexually sterile because their reproductive organs are not well developed.

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Assertion [A]: Klinefelter syndrome occurs only in males. Reason [R]: Klinefelter syndrome is characterised by an additional Y chromosome in the karyotype.

Assertion [A]: Klinefelter syndrome occurs only in males.

Reason [R]: Klinefelter syndrome is characterised by an additional Y chromosome in the karyotype.