More selection
This presentation is the property of its rightful owner.
Sponsored Links
1 / 24

More Selection PowerPoint PPT Presentation


  • 58 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

More Selection

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


More selection

More Selection


Divergent evolution

Divergent evolution


Divergent evolution1

Divergent evolution

  • Similar organisms evolve from a common ancestor


More selection

Did these two species 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.


Types of selection

Types of Selection


Stabilizing selection

Stabilizing selection


Stabilizing selection1

Stabilizing selection


Directional selection

Directional selection


Disruptive selection

Disruptive selection


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!


Artificial selection

Artificial Selection


More selection

?


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?


What about animals

What about animals?


Dog breeding

Dog breeding

  • Wolf  dog ancestor  modern breeds

  • Selected traits for hunting, companionship


Designer dogs

Designer dogs?


Questions

Questions?


  • Login