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Why is geographical isolation more effective in speciation when the time period is long?

Answer and explanation

Correct answer: Because genetic changes take many generations to accumulate

Geographical isolation separates populations and reduces interbreeding and gene flow. Evolutionary differences usually arise through many small changes, including mutation, recombination, drift and selection, rather than appearing in one generation. Over many generations these differences can accumulate and produce reproductive isolation, making speciation more likely. Therefore A is correct. B and C describe impossible instant events, while D contradicts the role of geographical isolation.

Related tags

Geographical IsolationSpeciationGenerationsHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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