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The Origin of Species

Discover the fascinating journey of species evolution and the mechanisms that drive speciation in biology. From prezygotic isolation to hybrid sterility, delve into the barriers that shape biological diversity. Learn about adaptive radiation, evolutionary trends, and the interplay between evolution and developmental biology. Exploring macroevolutionary processes like gradualism and punctuated equilibrium, understand how small changes over time lead to evolutionary novelties. Join us on this scientific exploration of the origin of species and the evolutionary forces at play.

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The Origin of Species

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  1. The Origin of Species

  2. Species • Biological Species

  3. Ring Species

  4. Prezygotic Habitat Isolation Behavior Isolation Temporal Isolation Mechanical Isolation Gametic Isolation Postzygotic Hybrid Sterility Hybrid Inviability Hybrid Breakdown Barriers

  5. Habitat Isolation

  6. Behavior Isolation

  7. Behavior Isolation

  8. Temporal Isolation

  9. Mechanical Isolation

  10. Gametic Isolation

  11. Hybrid Sterility

  12. Hybrid Inviability

  13. Hybrid Breakdown

  14. Modes of Speciation

  15. Allopatric Speciation

  16. Adaptive Radiation

  17. Sympatric Speciation • Autopolyploidy

  18. Sympatric Speciation • Allopolyploidy

  19. Macroevolution

  20. Gradualism • Also called “Neodarwinism” • Small changes over time • Supporter: Ernst Mayr

  21. Punctuated Equilibrium • Supporters: Niles Eldredge & Stephen J. Gould • Speciation occurs in episodic events – large periods of time with little change and short periods of time with large changes

  22. Origin of Evolutionary Novelty Most novelties are modified versions of older structures • preadaptation

  23. “Evo-devo” Evolutionary Biology and Developmental Biology working together

  24. Homeotic Genes Hox Genes- position information

  25. Evolutionary Trends • Evolutionary trends are not goal oriented

  26. Adaptive Radiation The emergence of numerous species from a common ancestor introduced into an environment, presenting a diversity of new opportunities and problems

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