KCET · BIOLOGY · STD 12 - 6. Evolution

Find the mismatch from the following pairs.

A Divergent evolution - Thorn of Bougainvillea and tendril of Cucurbita
B Adaptive radiation - Australian marsupials
C Natural selection - Industrial melanism
D Genetic drift frequency - Constant gene

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Answer & Solution

Correct Answer

(D) Genetic drift frequency - Constant gene

Step-by-step Solution

Detailed explanation

(D) Genetic drift frequency - Constant gene,
Genetic drift release to the alternation in the frequencies of alleles in the gene pool of a finite population due to chance events. It takes place in one or over a few generations. If the change in the allele frequencies is very drastic, then new species are formed.

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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