Chapter Outli

A Brief Overview of the Early

Development of Evolutionary Concepts Charles Darwin Evidence for Evolution Micreoevolution—Evolution Within Species Natural Selection Mutations Migration Genetic Drift Rates of Evolution ine

Macroevolution—How Species Evolve Reproductive Isolation Geographic Isolation Ecological Isolation Mechanical Isolation Other Isolating Mechanisms The Role of Hybridization in Evolution Apomixis Discussion Summary

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An introduction to the early development of evolutionary concepts is followed by a discussion of Charles Darwin and his contributions to the theory of evolution through natural selection. Evidence for evolution is given, and mechanisms of organic evolution, including mutations, migration, and genetic drift, are discussed. The roles of reproductive isolation and hybridization in the evolution of species are explored. The chapter concludes with a discussion of some aspects of past and present controversy surrounding evolution.

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