Chapter 25

Chapter 25 - Chapter 25- Phylogeny and Systematic...

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Chapter 25- Phylogeny and Systematic - Phylogeny: the evolutionary history of a species o Systematics: The study of biological diversity in an evolutionary context o Fossil record: The ordered array of fossils within layers, or strata, of sedimentary rock Paleontologists: study of fossils - The fossil record Sedimentary Rock: rock formed from sand and mud that once settled on the bottom of seas, lakes and marshes. o Dating: Relative geologic time scale; sequence of species Absolute radiometric dating Age using half- lives of radioactive isotopes - Biogeography The study of the past and present distribution of species o Pangaea – 250 mya Permian extinction o Geographic isolation – 180 mya Africa/ south American reptile fossil similarities Australian marsupials - Mass Extinction o Permian: 250 million years ago 90% of marine animals Pangaea merge o Cretaceous 65 million years ago Death of dinosaurs 50% of marine species
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This note was uploaded on 10/31/2011 for the course BIO 102 taught by Professor Robinson during the Spring '09 term at UPenn.

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Chapter 25 - Chapter 25- Phylogeny and Systematic...

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