Battling

Resistance

An antibiotic-resistant superbug is evolving to

overcome our drugs of last defense. How do we beat a

champion pathogen?

◆ (^) Clarify why evolution occurs only in populations, not in individuals.
◆ (^) Distinguish among directional, stabilizing, and disruptive selection.
◆ (^) Explain how natural selection brings about increased reproductive success of a
population in its environment.
◆ (^) Compare and contrast convergent evolution and evolution by common descent, and
give an example of each.
◆ (^) Describe how DNA mutations can create new alleles at random.
◆ (^) Illustrate how gene flow works and how it may inhibit evolution.
◆ (^) Relate the process of genetic drift to genetic bottlenecks and the founder effect,
using examples.
After reading this chapter you should be able to: