KCET · BIOLOGY · STD 12 - 4. Principles of Inheritance and Variation

Gynecomastia is a symptom of

A Turner's syndrome
B Down's syndrome
C Cri-du-chat syndrome
D Klinefelter's syndrome

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Answer & Solution

Correct Answer

(D) Klinefelter's syndrome

Step-by-step Solution

Detailed explanation

(D) Klinefelter's syndrome,
Gynecomastia is a condition that causes boy's and men's breast to swell and become larger than normal. This is a symptom of Klinfelter's syndrome.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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