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Why can a population with very low variation be at greater risk when a disease suddenly spreads?

Answer and explanation

Correct answer: Because most organisms may share the same weakness

Genetic variation means that individuals in a population differ in their traits, including disease resistance. When variation is very low, most organisms may possess the same susceptible feature. A newly spreading pathogen can then affect many individuals at once, leaving fewer survivors to reproduce. In a more varied population, some individuals may carry resistance and survive. Thus low variation can increase vulnerability; it does not mean that the population lacks genes.

Related tags

Genetic VariationDisease ResistancePopulation SurvivalHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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