In a population of bacteria, about 25 percent of the population has resistance to the antibiotic penicillin. After a few days, 50 percent of the population has the resistant gene. Assume the population did not simply reproduce. How might this antibiotic resistance have spread in the population?
A) The gene for antibiotic resistance is found in plasmids, which can be transferred between bacteria.
B) Bacteria are able to swap genes between their nucleoid and plasmids.
C) The antibiotic must have been introduced into the population, which then evolved by natural selection.
D) Genetic material in the nucleoid is shared among the population of bacteria.
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