1 / 13

15-3

15-3. Evolution in Process. Evidence of Evolution. 1. Homologous Structures 2. Analogous Structures 3. Vestigial Structures 4. Similarities in Embryology 5. Similarities in Macromolecules . 1. Homologous Structures. Similar features that originated in common ancestor (recent)

keona
Download Presentation

15-3

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 15-3 Evolution in Process

  2. Evidence of Evolution • 1. Homologous Structures • 2. Analogous Structures • 3. Vestigial Structures • 4. Similarities in Embryology • 5. Similarities in Macromolecules

  3. 1. Homologous Structures • Similar features that originated in common ancestor (recent) • Ex: human arm, bird wing, frog arm

  4. 2. Analogous Structures • Features which share a purpose but do not have common origin • Ex: bird wing insect wing

  5. 3. Vestigial Structures • Features which were useful to an ancestor but have no current use • Ex: • Human tail bone, appendix • Snake pelvic bones limb bones • Whale pelvic bones

  6. 4. Similarities in Embryology • “Ontogeny recapitulates phylogeny” • Embryological development repeats evolutionary history • Ernst Haeckel

  7. 5. Similarities in Macromolecules • Amino acid sequence (proteins) • Ex cytochrome C • The more similarities = the more recent common ancestor

  8. Patterns of EvolutionWays in Which Species Change • 1. Coevolution • 2. Convergent evolution • 3. Divergent evolution

  9. 1. Coevolution • Change of 2 or more species in close association with each other • Ex predator/prey flowers/pollinators

  10. 2. Convergent Evolution • Occurs when similar phenotypes in different species are selected in similar environment even though ancestors were very different • Ex shark & porpoise

  11. 3. Divergent Evolution • Occurs when 2 or more related populations or species become more & more different (usually due to habitat changes) • 2 types • Adaptive radiation • Artificial selection

  12. Adaptive Radiation • Many species from single common ancestor • Ex Darwin’s finches

  13. Artificial Selection • Selective breeding • Ex dogs, cats, horses, sheep, chickens, fruit

More Related