BIS2C+Lect1+Outline

BIS2C+Lect1+Outline - Week 1 • tree concepts • building...

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BIS2C W2012 Lecture 1 (9 January 2012) 1 Introduction to the tree of life (Ward) Today’s lecture What is the tree of life ? Topics to be covered in this class Tree terminology and concepts Later this week (through to Friday): Building phylogenetic trees Applications of phylogenetic trees What is the tree of life? Explanation of the terms “ tree of life ” and phylogeny . A tree is a simplified model of the genealogy of life. Why are phylogenetic trees interesting and informative? unifying principle of life: all organisms are related to one another through common decent phylogenetic trees allow us to trace the history of changes in morphology, behavior, geographical distributions, etc. phylogenetic trees allow us to better understand the process of evolution phylogenetic trees allow us to make predictions about the characteristics of organisms (may have important implications for human health and welfare) Topics to be covered in this class
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Unformatted text preview: Week 1: • tree concepts • building trees • interpreting trees Weeks 2-3: • rooting the tree of life • Bacteria • Archaea BIS2C W2012 Lecture 1 (9 January 2012) 2 Week 4: • unicellular eukaryotes Weeks 4-6: • plants Weeks 7-8: • fungi Weeks 8-11: • animals Week 11 • closing lecture: tree of life revisited Tree terminology and concepts Phylogenies and trees . Explanation of term taxon (plural: taxa ). Different ways of drawing trees. Trees and speciation: a tree is a simplified model of the multiplication and divergence of species. Some more tree terminology: terminal (or tip) taxa – the taxa at the tips of the tree; usually these are the only taxa directly observed internal nodes – hypothetical ancestral taxa internal branches – branches connecting internal nodes root or root node – the common ancestor of all taxa in the tree Branches can be rotated about nodes without changing the meaning of the tree....
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