1. Overuse of antibiotics has caused antibiotic resistance in some bacteria in a population. Which statement describes the most likely impact of natural selection on the bacterial population?
A. Beneficial mutations have decreased, resulting in a larger population than normal.
B. More antibiotic-resistant bacteria have survived, resulting in more offspring with this trait.
C. Only the genes for antibiotic resistance are now
expressed, eliminating other genes.
D. The bacteria have become genetically isolated, resulting in decreased reproductive rates.