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Chapter 24 The Origin of Species

Delve into the fundamental question of "What is a species?" and the evolution theory's explanation on species origin. Learn about morphospecies, extensive phenotype variation, biological species concepts, and the challenges of speciation, including reproductive barriers and modes of speciation. Discover examples of allopatric and sympatric speciation, adaptive radiation, gradualism vs. punctuated equilibrium, and predictions on evolutionary novelty.

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Chapter 24 The Origin of Species

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  1. Chapter 24The Origin of Species

  2. Question? • What is a species? • Comment - Evolution theory must also explain how species originate.

  3. Two Concepts of Species

  4. Morphospecies

  5. Problem • Where does extensive phenotype variation fit?

  6. Two Schools

  7. Biological Species

  8. Key Points Heaven Scent an F1 hybrid between 2 species, but sterile.

  9. Speciation Requires:

  10. Reproductive Barriers

  11. Main Types of Barriers

  12. Prezygotic - Types

  13. Habitat Isolation

  14. Behavioral Isolation

  15. Temporal Isolation

  16. Mechanical Isolation

  17. Gametic Isolation

  18. Postzygotic Types

  19. Reduced Hybrid Viability

  20. Reduced Hybrid Fertility

  21. Hybrid Breakdown

  22. Modes of Speciation

  23. Allopatric Speciation

  24. Example

  25. Another Example

  26. Conditions Favoring Allopatric Speciation

  27. Conditions Favoring Allopatric Speciation

  28. Result

  29. Adaptive Radiation

  30. Mechanism

  31. When the Environment Saturates

  32. Sympatric Speciation

  33. Plants

  34. Polyploid Types

  35. Autopolyploid

  36. Allopolyploid

  37. Animals

  38. Gradualism Evolution

  39. Gradualism Predicts:

  40. Problem

  41. Punctuated Evolution

  42. Punctuated Equilibrium

  43. Predictions

  44. Predictions

  45. Possible Mechanism

  46. Comment

  47. Origin of Evolutionary Novelty

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