3.15.06 L64

3.15.06 L64 - March 15, 2006 Lecture 64: Phylogeny...

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Lecture 64: Phylogeny Evolution by Natural Selection: Descent w/ Modification Natural selection acts non-randomly on random mutations Evolution does NOT imply “progress” towards a specific goal or ideal It does imply progress  toward adaptability to the environment. Patterns of Macroevolution Types of directional selection Rates of selection Evolutionary novelties and complexity Etc… Selection Appears to be a Creative Force The Pace of Evolution Varies Gradualism Model – i.e. gradual changes in butterfly wing color Punctuate Equilibrium Model – rapid switches in populations Macroevolution Major changes in form and function, i.e. the EYE  Eyes range from a simple patch of pigmented cells to the advanced camera-like eye of a  human. Heterochromy
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This note was uploaded on 02/11/2008 for the course BIO G 101 taught by Professor Gilbert,c. during the Fall '07 term at Cornell.

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3.15.06 L64 - March 15, 2006 Lecture 64: Phylogeny...

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