NEET 2002 Biology question

Some bacteria able to grow in Streptomycin containing medium due to -

(1)Natural selectionCorrect
(2)Induced mutation
(3)Reproductive isolation
(4)Genetic drift

Answer: (1)

Solution

In a large bacterial population a few individuals already carry spontaneous (pre-existing) mutations that make them resistant to streptomycin. When the antibiotic is present in the medium, the sensitive cells are killed and the resistant ones survive and multiply; this differential survival is natural selection (the

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Question ID VK-089038