BIOL 1108 Lecture Notes - Lecture 4: Great Dane, Disruptive Selection, Ecological Niche
Document Summary
The point where a branch splits = node (represents the common ancestor from which the descendant species diverged) But in actuality, they go much further, in that they portray evolutionary relationships (relationships among organisms which reflect their historical origin) Species are arranged into monophyletic groups (groups of two or more taxa having a common ancestor: monophyletic lineages comprise a common ancestor and all of its descendants. Branches in phylogenies are free to spin around each node, so you can"t infer phylogenetic relationships among groups based on their proximity on a tree, unless they are bracketed together. There are different ways of presenting the same information: these two are identical; they show the same information, o. It"s important to note that the length of the branches sometimes are drawn proportional to time: example, in this scenario, a and b diverged from their common ancestor much more recently than did c and d.
