In a study of the evolution of antibiotic resistance in bacteria, researchers find that resistance is more likely to develop in bacteria that are exposed to low levels of antibiotics. What is the primary mechanism driving this evolutionary change?
Q1. In a study of the evolution of antibiotic resistance in bacteria, researchers find that resistance is more likely to develop in bacteria that are exposed to low levels of antibiotics. What is the primary mechanism driving this evolutionary change?
Answer: Natural selection acting on pre-existing genetic variation
Explanation: Natural selection favors resistant bacteria, most tempting wrong option fails as mutation is less common.