Antibiotic resistance in bacteria is a striking example of
- Acheck_circle
Natural selection in action — resistant strains survive and reproduce in the presence of the drug
- B
Directed mutation — bacteria deliberately mutate target genes in response to drug presence
- C
Spontaneous adaptation — bacteria modify their cell walls in real time to repel the drug
- D
Lamarckian inheritance — bacteria acquire resistance from drug exposure and pass it to offspring
Explanation
Pre-existing resistant mutants are selected for in the presence of antibiotics. Over time, resistant strains dominate.