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Why is reproductive isolation important for speciation beyond mere distance?

Answer and explanation

Correct answer: Because a new species is clear when groups cannot reproduce successfully

Distance can reduce contact, but it does not by itself prove that two populations have become separate species. If separated groups meet again and produce fertile, viable offspring, gene flow can continue. Reproductive isolation—before mating, during fertilisation, or after offspring formation—prevents successful gene exchange and makes divergence biologically meaningful. Therefore option A is correct; the other statements incorrectly describe distance or isolation.

Related tags

SpeciationReproductive-IsolationGene-FlowHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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