CUET · BIOLOGY · PYQ PAPER 2025

Which one of the mentioned characters does not represent the true breeding line?

A A true breeding line is one that shows the stable trait inheritance.
B A true breeding line is one that shows the X-linked recessive trait.
C A true breeding line is one that having undergone continuous self-pollination.
D A true breeding line is one that shows stable expression for several generations.

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Answer & Solution

Correct Answer

(B) A true breeding line is one that shows the X-linked recessive trait.

Step-by-step Solution

Detailed explanation

A true breeding line is one that shows the X-linked recessive trait.

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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