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Why is the formation of a useful variation alone not enough for it to spread through a population?

Answer and explanation

Correct answer: It must be inherited and provide a survival or reproductive advantage

For a useful variation to become common, it generally must be heritable so that it can pass to offspring, and it must improve survival or reproductive success under the relevant conditions. Natural selection can then increase its frequency over generations, although chance and population structure also matter. Option A gives the essential requirements. B ignores inheritance and selection, C is false because variations may be beneficial, neutral or harmful, and D contradicts heredity.

Related tags

VariationInheritanceNatural SelectionHeredity And EvolutionScienceClass 10 Mcq

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