LIFESCI 1 Chapter 23: LS1 Week 3
Document Summary
Phylogeny: the history of descent with modification and the accumulation of change over time. Node: in phylogenetic trees, the point where a branch splits, representing the common ancestor from which the descendant species diverged. In plants, the point on a shoot where one or more leaves are attached. Phylogenetic tree: a diagrammed hypothesis about the evolutionary history, or phylogeny, of a species. Sister groups: groups that are more closely related to each other than either of them is to any other group. Taxon: all the species in a taxonomic entity such as a family or genus. Monophyletic: describes groupings in which all members share a single common ancestor not shared with any other species or group of species. Paraphyletic: describes groupings that include some, but not all, the descendants of a common ancestor. Polyphyletic: describes groupings that do not include the last common ancestor of all members. Class: in the linnaean system of classification, a group of closely related orders.
