1 / 13

Modern Taxonomy

Modern Taxonomy. Bat, cat, human and a whale?. Homologous Structures. Phylogeny. Phylogeny. Defined: T he connections between all groups of organisms as understood by ancestor/descendant relationships. Phylogeny is the evolutionary history of a species. . Cladistics.

madra
Télécharger la présentation

Modern Taxonomy

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. Modern Taxonomy

  2. Bat, cat, human and a whale?

  3. Homologous Structures

  4. Phylogeny

  5. Phylogeny • Defined: • The connections between all groups of organisms as understood by ancestor/descendant relationships. Phylogeny is the evolutionary history of a species.

  6. Cladistics A method that reconstructs phylogenies by inferring relationships based on shared derived characteristics.

  7. Cladistics • A derived character evolved in the ancestor of one group but not of the other.

  8. Shared derived characteristics?

  9. Shared derived characteristics? • Clads

  10. Cladogram • Shows evolutionary relationships among groups of organisms. • Organisms that share derived characters are grouped together. • As groups evolve, new derived characters appear that were not present in earlier organisms. • Usually start with an out-group.

  11. Cladogram Examples

  12. Cladogram Examples

  13. What is Cladistics used for? • We have a perfectly good system for classifying organisms why change it?

More Related