BIO 200 Lecture Notes - Lecture 3: Phylogenetic Tree, Monophyly, Common Descent
28 Nov 2017
School
Department
Course
Professor
Document Summary
How to make trees from molecular data: parsimony. And if you don"t have molecular data: homology and homoplasy. Does taxonomy reflect phylogeny: monophyly and paraphyly. A graphic representation of the evolutionary history of a particular group of organisms or their genes. We call a series of ancestor and descendant populations a lineage, which we can depict as a line drawn on a time axis, as shown in figure 21. 1. For example, a geographic barrier may divide an ancestral population into two descendant populations that no longer interbreed with one another. We depict such an event as a split, or node, in a phylogenetic tree. Any group of species that we designate with a name is a taxon (plural taxa). Examples of familiar taxa include humans, primates, mammals, and vertebrates; in this series, each taxon is also a member of the next, more. 16. vertebrates; in this series, each taxon is also a member of the next, more inclusive taxon.
