A bacterial population contains a small proportion of
antibiotic‑resistant mutants that grow more slowly than
susceptible bacteria. In the absence of antibiotics, bacteria that are susceptible
dominate. During prolonged antibiotic exposure, resistant bacteria rapidly take
over the population.

If antibiotic exposure continues over many
generations, which pattern of selection will most likely occur?

Question

A bacterial population contains a small proportion of
antibiotic‑resistant mutants that grow more slowly than
susceptible bacteria. In the absence of antibiotics, bacteria that are susceptible
dominate. During prolonged antibiotic exposure, resistant bacteria rapidly take
over the population.

If antibiotic exposure continues over many
generations, which pattern of selection will most likely occur?

Accepted Answer

Directional
selection favouring resistance despite fitness cost

Answer

Stabilizing
selection maintaining susceptibility

Answer

Genetic
drift

Answer

Diversifying
selection maintaining both types

Crowdly

A bacterial population contains a small proportion of antibiotic‑resistant muta...

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