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(D) Geographical isolation acts as a physical barrier that prevents gene flow between populations of the same species.Over time,these isolated populat

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Speciation through reproductive isolation

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(D) Geographical isolation acts as a physical barrier that prevents gene flow between populations of the same species.Over time,these isolated populations accumulate different genetic variations due to mutations,genetic drift,and natural selection in their respective environments.Eventually,these genetic differences become so significant that the populations can no longer interbreed even if they come into contact again.This process,known as reproductive isolation,leads to the formation of new species,a process called speciation.

What is a significant consequence of geographical isolation?

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Statement-$I$: The fitness according to Darwin,refers ultimately and only to reproductive fitness.
Statement-$II$: Those who are better fit in the environment leave less progeny than others.

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