4.03.06 L69 - April 3 2006 Lecture 69 Evolution Development...

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April 3, 2006 Lecture 69: Evolution, Development, and Diversity Figuring out times on a phylogenetic tree • radioactive dating • relative dating Continents • Split up and regroup on a regular basis • Called a Wilson Cycle Scale • First fossils, 3.6bya • Accumulating oxygen 2.9-2.2 bya • 2.2 bya – 1 st  eulkaryotes • 1.8 bya – ozone develops • 1.4 bya – Modern Eukaryotes • 550 mya – Cambrian Explosion (when most plants, animals, and fungi evolved.) KT Extinction (Asteroid)5 PT Extinction Appearance of Multicellular fossils Paleozoic, Mesozoic, Cenozoic
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