A population of bacteria may evolve resistance to a drug over time. This graph s

Question

A population of bacteria may evolve resistance to a drug over time. This graph shows the growth of a bacterial population before and after the introduction of an antibiotic, with some bacteria becoming resistant to the antibiotic. Part B . Thinking critically Which three statements may correctly explain why the population size increases after time point C? Because the population grew more rapidly after time point C, the bacteria must have acquired a second drug- resistance mutation. 0 The population increase just after time point C indicates that antibiotic use was discontinued Bacteria that acquired a mutation that conferred drug- resistance had a growth advantage over non-resistant bacteria. Between time points C and D, drug-resistant bacteria were reproducing faster than non- drug resistant bacteria were dying Time The few drug-resistant bacteria in the population reproduced, quickly leading to a large drug-resistant population.

Explanation / Answer

Which three statements may correctly explain why the population size increases after time point C?

A) Because the population grew more rapidly after time point C, the bacteria must have acquired a second drug-resistance mutation.

B) The population increase just after time point C indicates that antibiotic use was discontinued.

C) Bacteria that acquired a mutation that conferred drug-resistance had a growth advantage over non-resistant bacteria.

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