A bacterial population is treated with the antibiotic penicillin. The majority of the bacteria die. Nevertheless, some bacteria in the population possess an allele that codes for an enzyme capable of breaking down penicillin. These bacteria are able to survive. Which could account for how these bacterial cells obtained this allele?
- A1, 2 and 3
- B1 and 3 only
- C1 only
- D2 and 3 only