MHT CET · BIOLOGY · STD 12 - 3. Inheritance and Variation

Select the CORRECT statement.

A Sex linked traits appear more frequently in females.
B Colour blindness is caused due to proper formation of colour sensitive cells.
C Human females have double dose of X chromosome.
D Drone bees produce sperms by meiosis.

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Answer & Solution

Correct Answer

(C) Human females have double dose of X chromosome.

Step-by-step Solution

Detailed explanation

Sex-linked traits appear more frequently in males as they have only one 'X' chromosome so the recessive gene gets a chance to express itself. Colour blindness is caused due to defect in gene that prevents the proper formation of colour sensitive cells in the retina. Drone bees produce sperms by mitosis.

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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