Presentation on theme: "Section 17.2 Summary – pages"— Presentation transcript:
1Section 17.2 Summary – pages 450-459 Phylogenetic Classification: ModelsThe evolutionary history of a species is called its phylogeny (fy LAH juh nee).A classification system that shows the evolutionary history of species is a phylogenetic classification and reveals the evolutionary relationships of species.Section 17.2 Summary – pages
2Section 17.2 Summary – pages 450-459 CladisticsOne biological system of classification that is based on phylogeny is cladistics (kla DIHS tiks).Scientists who use cladistics assume that as groups of organisms diverge and evolve from a common ancestral group, they retain some unique inherited characteristics that taxonomists call derived traits.Section 17.2 Summary – pages
4Using a Cladogrambranches indicate development of new or significantly different traitsgroups that are closer together on the cladogram probably share a more recent common ancestor than groups that are farther apart.
5Fan Diagrams do not show direct ancestry, just a probable sequence can show time line and numbers of organisms in related groupsorganisms that are closer in the same colored ray share more characteristics