19: The Evolution of Populations Last updated Mar 6, 2021 Save as PDF 18.5I: Biogeography and the Distribution of Species 19.1: Population Evolution Page ID12579 BoundlessBoundless ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy19.1: Population Evolution19.1A: Defining Population Evolution19.1B: Population Genetics19.1C: Hardy-Weinberg Principle of Equilibrium19.2: Population Genetics19.2A: Genetic Variation19.2B: Genetic Drift19.2C: Gene Flow and Mutation19.2D: Nonrandom Mating and Environmental Variance19.3: Adaptive Evolution19.3A: Natural Selection and Adaptive Evolution19.3B: Stabilizing, Directional, and Diversifying Selection19.3C: Frequency-Dependent Selection19.3D: Sexual Selection19.3E: No Perfect Organism