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Unformatted text preview: Introduction to Phylogenetic Trees BMI/CS 576 www.biostat.wisc.edu/bmi576.html Mark Craven firstname.lastname@example.org Fall 2011 Phylogenetic inference: task definition Given data characterizing a set of species/genes Do infer a phylogenetic tree that accurately characterizes the evolutionary lineages among the species/genes undirected case: a graph without cycles directed case: underlying undirected graph is a tree (sometimes it is required that indegree( v ) ! 1 for all v ) What is a tree? Phylogenetic tree basics leaves represent things (genes, species, individuals/ strains) being compared the term taxon ( taxa plural) is used to refer to these when they represent species and broader classifications of organisms internal nodes are hypothetical ancestral units in a rooted tree, path from root to a node represents an evolutionary path the root represents the common ancestor an unrooted tree specifies relationships among things, but not evolutionary paths Motivation...
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- Fall '11