Patterns of evolution
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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