Question

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

• A. Genetic Drift
• B. Reproductive isolation
• C. Natural selection
• D. Induced mutation

Answer 1

The correct option is C

Natural selection

The correct option is C.

The explanation for the correct option:

1. Bacterial colonies that grow on specific media have built-in variations in their ability to utilize feed components.
2. When the composition of the medium changes, the bacterial population changes for survival.
3. Mutations happen in the bacteria to show antibiotic resistance in the penicillin medium.
4. Finally, the fittest bacterias survive in the penicillin medium.
5. This happens through natural selection.

The explanation for incorrect options:

Option A:

Gene drift is defined as random changes occurring in the genes of a population.

Option B:

Reproductive isolation is the inability of species to breed with other related species for different reasons.

Option D:

Induced mutation occurs when an organism's DNA is exposed to a mutagen.

Final Answer: Some bacteria can grow in a Penicillin-containing medium due to natural selection.