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Chapter Outline
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13.1 The Scientific Concept of Evolution
13.2 The Development of Evolutionary Thought
    Early Thinking About Evolution
    The Theory of Natural Selection
    Modern Interpretations of Natural Selection

13.3 The Role of Natural Selection in Evolution
13.4 Common Misunderstandings About Natural Selection
13.5 What Influences Natural Selection?
    The Mechanisms That Affect Genetic Diversity
    The Role of Gene Expression
    The Importance of Excess Reproduction

13.6 The Processes That Drive Selection
    Differential Survival
    Differential Reproductive Rates
    Differential Mate Choice—Sexual Selection

13.7 Patterns of Selection
    Stabilizing Selection
    Directional Selection
    Disruptive Selection

13.8 Evolution Without Selection—Genetic Drift
13.9 Gene-Frequency Studies and the Hardy-Weinberg Concept
    Determining Genotype Frequencies
    Why Hardy-Weinberg Conditions Rarely Exist
    Using the Hardy-Weinberg Concept to Show
    Allele-Frequency Change

13.10 A Summary of the Causes of Evolutionary Change
OUTLOOKS 13.1: Common Misconceptions About the Theory of Evolution
HOW SCIENCE WORKS 13.1: The Voyage of HMS Beagle, 1831–1836
OUTLOOKS 13.2: Genetic Diversity and Health Care
OUTLOOKS 13.3: The Reemerging of Infectious Diseases





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