Chapter 7 Outline

What Is Random Genetic Drift?

The Genealogy of Genes

How Strong Is Genetic Drift?

  • Populations that change in size

Drift and Genetic Variation within Species

  • Estimating population size

Genetic Drift and Natural Selection

  • Crossing an adaptive valley by drift
  • The fate of beneficial mutations in large populations

The Evolution of Differences among Species

  • The neutral theory of molecular evolution

Searching the Genes for Signatures of Adaptation

  • Synonymous versus nonsynonymous differences
  • The MK test
  • Divergence among populations