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Reading a Phylogenetic Tree

Reading a Phylogenetic Tree. The Meaning of Monophyletic Groups by David Baum Nature Education 2008 www.nature.com/scitable PowerPoint presentation prepared by Larry Flammer ENSI Webmaster. What an Evolutionary Tree Represents. Zoooooming out…. OVERVIEW.

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Reading a Phylogenetic Tree

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  1. Reading a Phylogenetic Tree The Meaning of Monophyletic Groups by David Baum NatureEducation 2008 www.nature.com/scitable PowerPoint presentation prepared by Larry FlammerENSI Webmaster

  2. What an Evolutionary Tree Represents

  3. Zoooooming out…

  4. OVERVIEW

  5. Branching pattern of four species

  6. Phylogenetic terminology Terminals / Taxa

  7. A monophyletic group = CLADE

  8. How to Read anEvolutionary Tree Information on patterns of evolutionary decent is the same regardless of the lengths of branches

  9. These trees depict equivalent relationships despite different styles

  10. Equivalent relationships, even though internal branches rotated

  11. Tree shows relative timing of nodes only when nodes are on same path from root

  12. The Importance ofPhylogenetic Trees 1. Increasing use of phylogenetic trees in the biological sciences 2. Need to know what trees diagrams do and do not communicate 3. Provide an efficient structure for organizing biodiversity info 4. Develop accurate conception of totality of evolutionary history 5. Important for aspiring biologists to develop this understanding

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