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Exploring Mechanisms of Adaptive Evolution: Natural and Sexual Selection

Discover how natural selection depends on variation such as mutation and sexual recombination, while sexual selection operates through intersexual and intrasexual competition. Learn why organisms are not perfect due to historical constraints and how adaptations are compromises shaped by chance and selection interactions.

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Exploring Mechanisms of Adaptive Evolution: Natural and Sexual Selection

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  1. Chapter 23 Discussion Points -Mechanisms of Adaptive Evolution

  2. Mechanisms of Adaptive Evolution • Natural Selection • Sexual Selection

  3. Natural Selection Depends on Variation • Sources of variation: • Mutation • Point mutation • Duplication • Higher rates in bacteria & viruses • Sexual recombination • Types of variation: • Polymorphism • Geographic variation/clines

  4. Types of Natural Selection

  5. Maintaining Variation • Diploidy • Heterozygote advantage • Neutral variation & pseudogenes

  6. Sexual Selection • Intersexual • Intrasexual

  7. Why Aren’t Organisms Perfect? • Limited by historical constraints • Adaptations are often compromises • Chance & natural selection interact • Selection can edit only existing variations

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