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.
Frequently asked questions
What is the correct answer to this question?
Resistant bacteria survive the drug and multiply
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Heredity and Evolution.
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