BIO SCI 94 Lecture Notes - Lecture 6: Data Matrix, Synapomorphy, Extinction Event

• School: UC-Irvine
• Department: Biological Sciences
• Course: BIO SCI 94
• Professor: Robin Bush

Document Summary

In this chapter you will learn that vast amounts of change have occurred in the. The evolutionary history of a group of organisms is called its phylogeny. A phylogenetic tree is a graphical summary of this history, showing the ancestor-descendant relationships among populations, species, or higher taxa, and clarifying who is related to whom. The tree of life is the most universal of all phylogenetic trees. Provide evidence for the endosymbiosis theory (mitochondria and chloroplasts originated as free-living bacteria. Examine how hiv jumped from primates to humans. Help identify species that are priority for conservation. Branches on left are more ancestral, the ones on the right are more recent, or derived. Nodes or forks represent hypothetical common ancestors. A character is any genetic, morphological, physiological, or behavioral characteristic studied. A species that is closely related to the group being studied but not part of it is an outgroup. An ancestral trait existed in an ancestor.