CUET · BIOLOGY · PYQ PAPER 2025

Which one of the following statements is not the salient feature of Human Genome Project?

A The average gene consists of 3000 bases, but sizes vary greatly, with the largest known human gene being dystrophin at 2.4 million bases.
B The total number of genes is estimated at 30,000-much lower than previous estimates of 80,000 to 1,40,000 genes.
C Less than 9 per cent of the genome codes for proteins.
D Repetitive sequences are stretches of DNA sequences that are repeated many times, sometimes hundred to thousand times.

Verified Solution

Answer & Solution

Correct Answer

(C) Less than 9 per cent of the genome codes for proteins.

Step-by-step Solution

Detailed explanation

Less than 9 per cent of the genome codes for proteins.

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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