intro-phylogeny

intro-phylogeny - Introduction to Phylogenetic Trees BMI/CS...

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Unformatted text preview: Introduction to Phylogenetic Trees BMI/CS 576 www.biostat.wisc.edu/bmi576.html Mark Craven [email protected] 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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intro-phylogeny - Introduction to Phylogenetic Trees BMI/CS...

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