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Patterns of Evolution. Patterns in Evolution. Natural selection leads to many predictable outcomes On a grander scale, these predictable outcomes produce recognizable patterns in evolution. Divergent Evolution Convergent Evolution Coevolution. Divergent Evolution.

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patterns in evolution
Patterns in Evolution
  • Natural selection leads to many predictable outcomes
  • On a grander scale, these predictable outcomes produce recognizable patterns in evolution

Divergent Evolution

Convergent Evolution

Coevolution

divergent evolution
Divergent Evolution
  • Divergent evolution is alsocalled adaptive radiation
  • A common ancestor gives rise to many different species that each fill a different ecological niche.
    • Niche: All factors related to the role of an organism in the environment (predators, prey, habitat, nocturnal/diurnal, etc)
divergent evolution cont
Divergent Evolution (cont)
  • Examples:
    • Ontario rodents
    • Galapagos finches
convergent evolution
Convergent Evolution
  • Different species that do not share a recent common ancestor have evolved similar traits because they experience the same selective pressures (analogous features)

Ex. 1 Eyes of spiders and humans

Ex. 2 Streamlined body shape of sharks and dolphins

coevolution
Coevolution
  • Two species evolve simultaneously when the survival of one species is influenced by the other
  • Examples:
    • Predator-Prey: “evolutionary arms race”
    • Flowering plants and pollinators
    • Species that rely on mimicry for survival will continue to evolve if the species they mimic changes
video
Video
  • Evolutionary arms race between snakes and newts
  • http://www.pbs.org/wgbh/evolution/library/01/3/l_013_07.html
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