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Why can reproductive isolation be considered more important than mere distance in the formation of a new species?

Answer and explanation

Correct answer: Because a new species is established when separated groups can no longer produce successful fertile offspring

The governing concept is the biological species concept. Geographic distance can reduce contact, but it does not by itself prove that two populations are separate species. If individuals from the populations can meet and produce viable, fertile offspring, gene flow can continue. Reproductive isolation prevents such successful gene exchange and makes divergence permanent. Thus option A is correct, whereas B, C, and D contradict chromosome biology or evolutionary reasoning.

Related tags

Reproductive-IsolationSpeciationGene-FlowHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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