Chapter 27 PHYLOGENIES AND THE HISTORY OF LIFE

Chapter 27 PHYLOGENIES AND THE HISTORY OF LIFE -...

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Themes and Patterns over the last 4.6 billion years. Summary *Tools for studying the history of life *Data *Key changes – how they occur *Adaptive radiations and mass extinctions Tools for Studying the History of Life *Phylogenies     :  evolutionary histories of groups (taxa) of organisms usually depicted as  trees.  Note, phylogenies are hypotheses . *Fossils      – collection continues to grow, transitional forms are found and relationships  are refined. Phylogenies as Trees *“Estimates” or hypotheses of the relationships among organisms. *Reading the tree: *Root     *Branches     *Nodes      (forks) *Branch Tips *Outgroup      –  *Types of phylogenies *Monophyletic group      or Clade   or  lineages *Paraphyletic group        *Polyphyletic group      *How are they constructed? *What would you look for or compare? *Systematics – 2 approaches
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This note was uploaded on 09/08/2011 for the course BIOL 1403 taught by Professor Dini during the Fall '09 term at Texas Tech.

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Chapter 27 PHYLOGENIES AND THE HISTORY OF LIFE -...

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