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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 may exhibit gynaecomastia. Reason (R): Klinefelter's syndrome is caused by the presence of an extra Y chromosome, resulting in a karyotype of 47 , XYY. In the light of the above statements, choose the correct answer fro

Options

  1. ABoth (A) and (R) are true and (R) is the correct explanation of (A)
  2. BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
  3. C(A) is true but (R) is false
  4. D(A) is false but (R) is true

Correct answer

C. (A) is true but (R) is false

Step-by-step solution

Assertion (A) is true: Individuals with Klinefelter's syndrome have overall masculine development, but feminine development such as gynaecomastia (development of breasts) is also expressed. Reason (R) is false: Klinefelter's syndrome is caused by the presence of an additional copy of the X chromosome, not the Y chromosome. The resulting karyotype is 47 , XXY, rather than 47 , XYY. Therefore, (A) is true but (R) is false. Answer: (A) is true but (R) is false

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