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The Origin of Species

The Origin of Species. AP Biology Chapter 24.4. Review: Speciation. Process of making a species Biological Species Concept: Populations are no longer capable of interbreeding. Speciation & Time. Is speciation a slow process? Fast process? Both?. Speciation & Time. Charles Darwin

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The Origin of Species

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  1. The Origin of Species AP Biology Chapter 24.4

  2. Review: Speciation • Process of making a species • Biological Species Concept: • Populations are no longer capable of interbreeding

  3. Speciation & Time • Is speciation a slow process? Fast process? Both?

  4. Speciation & Time • Charles Darwin • Gradualism: • Slower process gradually developing species • Support: • Various fossil lineages • Variation in large populations • Allopatric speciation

  5. Speciation & Time • Stephen J. Gould • Punctuated Equilibrium: • Rapid process & is followed by long periods of stasis • Support: • Various fossil lineages • Sympatric speciation • Adaptive Radiation

  6. Patterns in Speciation • Convergent Evolution: • Distantly related species converge on similar structures • Bats, Birds, Butterflies wings are analogous structures

  7. Patterns in Speciation • Parallel Evolution: • Similar environments produce many similar species

  8. Patterns in Speciation • Coevolution? • Probably incorrectly applied to interspecific competition

  9. Speciation Misconceptions • Evolution is not goal oriented! • There is no primary body plan for any species • Natural Selection must work with current body plan • Ex: 6 wings on birds would be awesome • Adaptations are often compromises • Ex: Seal flippers instead of legs

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