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More Selection. Divergent evolution. Divergent evolution. Similar organisms evolve from a common ancestor. Did these two species evolve from a common ancestor?. Convergent evolution. Large front paws Small eyes Tapered nose. Large front paws Small eyes Tapered nose. Different ancestor.

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Presentation Transcript
divergent evolution1
Divergent evolution
  • Similar organisms evolve from a common ancestor
convergent evolution
Convergent evolution
  • Large front paws
  • Small eyes
  • Tapered nose
  • Large front paws
  • Small eyes
  • Tapered nose

Different ancestor

convergent evolution1
Convergent evolution

Organisms from different evolutionary lineages may evolve analogous adaptations to similar environments.

disruptive selection1
Disruptive selection
  • Extreme traits are favored
  • Population divided into two distinct groups
sexual selection
Sexual selection

Superb bird of paradise mating dance video

sexual selection1
Sexual selection
  • Acts on organism’s ability to obtain or successfully reproduce with a mate.
  • Often powerful enough to produce features that are harmful to survival (i.e. attract predators)

Can lead to extreme differences in male/female phenotypes!

teosinte modern corn
Teosinte modern corn
  • Wild grass from Mexico and Central America
  • Can pollinate cultivated corn to produce viable seeds
  • What selective pressure did humans put on teosinte to develop modern corn?
dog breeding
Dog breeding
  • Wolf  dog ancestor  modern breeds
  • Selected traits for hunting, companionship
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