Some bacteria are able to grow in Penicillin containing medium due to

  1. a) Genetic Drift
  2. b) Reproductive isolation
  3. c) Natural selection
  4. d) Induced mutation

Answer: c) Natural selection.

Explanation: A colony of bacteria growing on a given medium has built-in variations in terms of the ability to utilise a feed component. Any change in the medium composition will bring about a change in the bacterial population for survival purposes. Mutations happen in the bacteria to show antibiotic resistance in the penicillin medium. Finally, the fittest bacterias survive in the penicillin medium. This happens through natural selection.

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