Lecture 023 - Seeing The Forest For The Trees Phylogenies

Lecture 023- - Seeing the forest for the trees phylogenies Bio1222 Taxonomic hierarchy Reading trees Building trees what traits homoplasy vs

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1 Bio1222 Seeing the forest for the trees: phylogenies Seeing the forest for the trees: phylogenies • Taxonomic hierarchy • Reading trees • Building trees – what traits? – homoplasy vs homology –p a r s im o n y • Using trees Bio1222 Classifying organisms: taxonomic hierarchy Classifying organisms: taxonomic hierarchy • Linnaean system: taxa are nested in a hierarchy • We are: –D om a i n Eukarya –K i n
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2 Bio1222 Tree talk ( Tree talk ( phylogenetic phylogenetic vocabulary) vocabulary) •Phy logeny – pattern of evolutionary relationships among taxa (species or larger groups) • Most recent common ancestor •Cenance s to r(LUCA )
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3 Bio1222 Principles of Phylogenetics • Evolutionary relationships reflect how recently taxa shared a common ancestor – reconstruct phylogenies using similarity – Rationale: similarity reflects shared ancestry (homology) Bio1222 Homology versus Homology versus homoplasy homoplasy • Homology (homologous traits) •Homop la sy
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4 Bio1222 Convergence (analogous traits) Convergence (analogous traits) Bio1222 Divergence Divergence
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This note was uploaded on 04/04/2009 for the course BIOLOGY 1222 taught by Professor Haffie during the Spring '09 term at UWO.

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Lecture 023- - Seeing the forest for the trees phylogenies Bio1222 Taxonomic hierarchy Reading trees Building trees what traits homoplasy vs

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