BIOL 190 Lecture Notes - Lecture 29: Ingroups And Outgroups, Convergent Evolution, Synapomorphy

• School: University of San Diego
• Department: Biology Courses
• Course: BIOL 190
• Professor: Leavitt, Dean

Document Summary

Average population tness (w-bar) will increase over time as less t genotypes become more rare, unless there is no variation. Overdominance is the one example where population w-bar <1 at equilibrium. Phylogeny: revolutionary history of a group of organisms. Represented in a tree shaped diagram node represents where an evolutionary split occurred. Two gene pools are formed at this split. Changing a node dramatically changes phylogeny i. e. don"t do it. Each branch represents the genes owing through the pipe for one species. Pipe represents changes in time, rather than position. Each pipe may be broken up into generations through cross sections. Rotation of branches does not necessarily change the phylogeny. Occasionally amount of time will be given based on length of branch. Internal node splitting of ancestries group into 2 descendants. A node with 3 or more branches that descend from a single node in the phylogeny.