AP Biologymediummcq1 pt
Antibiotic resistance in bacteria is an example of
A.evolution by natural selection in real time
B.bacteria choosing to mutate
C.acquired characteristics
D.a myth
Explanation
Core Concept
Antibiotics impose strong selection on bacterial populations. Resistant variants—arising from standing genetic variation, mutation, or acquisition of resistance genes—are more likely to survive and reproduce under treatment, causing resistance-associated alleles to increase in frequency. The key evolutionary point is differential survival and reproduction, not that resistance must always begin as a new mutant that then 'sweeps.'
Correct Answer
Aevolution by natural selection in real time
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