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Chapter 23 Discussion Points

Chapter 23 Discussion Points. -Mechanisms of Adaptive Evolution. Mechanisms of Adaptive Evolution. Natural Selection Sexual Selection. Natural Selection Depends on Variation. Sources of variation: Mutation Point mutation Duplication Higher rates in bacteria & viruses

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Chapter 23 Discussion Points

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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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