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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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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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