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How is the development of drug resistance in bacteria related to natural selection?

Answer and explanation

Correct answer: Resistant bacteria survive the drug and multiply

Bacterial populations may contain heritable variation, including occasional resistance. When an antibiotic is applied, susceptible bacteria are more likely to die, whereas resistant individuals survive. The survivors reproduce and pass the resistance trait to offspring, so resistance becomes more common in later generations. Thus option A correctly describes natural selection. The drug selects existing or newly arising variation; it does not make every bacterium equally strong.

Related tags

Natural-SelectionBacteriaAntibiotic-ResistanceVariationHeredity And EvolutionWorld Of LivingScienceClass 10 Mcq

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