Practice question

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Question

The average body length of Drosophila nasuta collected from Andaman and Nicobar Islands is 2 mm. From this population, a few males and females having a body length of 3 mm were selected and interbred. The average body length of the resultant progeny was 2.5 mm. The heritability (h ² ) of the body length in this population is ______. (round off to one decimal place) (NAT)

Explanation

Mechanistically, evolutionary adaptation involves selection and population dynamics shape traits. This validates Option NAT because it explains adaptive diversity, a pattern repeatedly demonstrated in ecology and evolution research. This mechanism is extensively documented and reinforced by experimental data across multiple model systems and textbook discussions.

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