| Chapter 9 | Evolution and Natural Selection |
| 9.1 | Darwin |
| Darwin's Voyage on the HMS Beagle | |
| Darwin and Malthus | |
| Natural Selection | |
| How Darwin Came to Write His Book | |
| 9.2 | The Evidence for Evolution |
| The Fossil Record | |
| Dating Fossils | |
| What the Fossil Record Says | |
| The Molecular Record | |
| The Ticking of the Molecular Clock | |
| Building Molecular Family TreesV | |
| Comparing Organisms | |
| Development Reveals Past Evolution | |
| Sharing the Same Parts | |
| "Leftover" (Vestigial) Organs | |
| 9.3 | How Populations Evolve |
| Genes Within Populations | |
| Why Do Allele Frequencies Change? | |
| Mutation | |
| Migration | |
| Genetic Drift | |
| Nonrandom Mating | |
| Selection | |
| Forms of Selection | |
| Directional Selection | |
| Stabilizing Selection | |
| Disruptive Selection | |
| 9.4 | Adaptation: Evolution in Action |
| Sickle-Cell Anemia | |
| The Puzzle: Why So Common? | |
| The Answer: Balancing Selection | |
| Industrial Melanism | |
| The Peppered Moth | |
| The Concealment Hypothesis | |
| Testing the Hypothesis | |
| An Overview of Natural Selection | |
| 9.5 | How Species Form |
| The Species Concept | |
| Ecological Races | |
| Isolating Mechanisms | |
| Adaptive Radiation | |
| Does Evolution Occur in Spurts? |