Biology 1001A Lecture Notes - Lecture 19: Autapomorphy, Ingroups And Outgroups, Symplesiomorphy
7 Mar 2016
School
Department
Course
Professor
Document Summary
For any two species, we can trace back and see the common ancestor they shared: reading phylogenies. Node most common ancestor for recent species. Root of phylogeny (way back in evolutionary time) Some phylogenies convey more info than branching order. Diff taxa/organisms/species may have diff branch lengths = indicates that species evolved more quickly. Number of morphological changes: using phylogenies in classification. If group names reflect evolutionary relationships, then all members of a named group are closer related to e. o than to anything outside the group. All members of a named group should be more closely related to e. o than any other groups. Monophyletic group w/ 1 recent common ancestor (blue circle); includes all of the decesdents of the group"s most common ancestor. Orange circle = most common recent ancestor is at the very base (not monophyletic group) = not a clade. Non monophyletc group = ignores one or two organisms on tip of phylogenetic tree.
