lecture_notes_11_26_07

lecture_notes_11_26_07 - Phylogenies and Tree Thinking The...

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1 Phylogenies and Tree Thinking The af f nities of all the beings of the same class have sometimes be represented by a great tree. I believe this simile largely speaks the truth…… …The green and budding twigs may represent existing species; and those produced during former years may represent the long succession of extinct species…. . ….the great Tree of Life ….covers the earth with ever-branching and beautiful rami f cations Charles Darwin, On the Origin of Species ; pages 131-132 Darwin’s great insight • Organisms show evidence of common ancestry • There is a “tree of life" Phylogenies are the language of common ancestry Phylogenies are widely used in modern biology Warnecke et al. (2007) Metagenomic and functional analysis of hindgut microbiota of a wood- feeding higher termite. Nature 450, 560-565 Learning goals • A tree represents the history of evolutionary lineages • Traits accumulate along the branches of the tree of life • Evolutionary relatedness is determined by
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lecture_notes_11_26_07 - Phylogenies and Tree Thinking The...

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