Asked by fernanda
Which type of bacteria have the greatest fittness?
A. Bacteria that become antibiotic resistant and are able to reproduce
B. Bacteria that are killed off by antibiotics
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A. Bacteria that become antibiotic resistant and are able to reproduce.
Reason: "Fitness" means reproductive success in a given environment. When antibiotics are present, resistant bacteria survive and reproduce while susceptible ones are killed, so resistant bacteria have higher fitness. (Note: in an antibiotic-free environment some resistance mutations can carry a cost, so susceptible strains may sometimes be more fit there.)
Reason: "Fitness" means reproductive success in a given environment. When antibiotics are present, resistant bacteria survive and reproduce while susceptible ones are killed, so resistant bacteria have higher fitness. (Note: in an antibiotic-free environment some resistance mutations can carry a cost, so susceptible strains may sometimes be more fit there.)
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