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NEETZoologyPrinciples of Inheritance and Variation

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): An individual with Klinefelter's syndrome has overall masculine development but also expresses feminine development such as gynaecomastia. Reason (R): This genetic disorder is caused by the presence of an additional copy of the Y-chromosome resulting in a karyotype of 47, XYY. In the light of the a

Options

  1. ABoth Assertion and Reason are correct and Reason is the correct explanation of Assertion.
  2. BBoth Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
  3. CAssertion is correct but Reason is not correct.
  4. DAssertion is not correct but Reason is correct.

Correct answer

C. Assertion is correct but Reason is not correct.

Step-by-step solution

Assertion is correct as individuals with Klinefelter's syndrome have overall masculine development along with the expression of feminine traits like gynaecomastia (development of breast). Reason is incorrect because Klinefelter's syndrome is an allosomal aneuploidy caused by the presence of an additional copy of the X-chromosome, resulting in a karyotype of 47, XXY. An additional Y-chromosome (47, XYY) causes a different condition. Therefore, the Assertion is correct but the Reason is not correct. Answer: Assertion

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