Bio notes 1

Bio notes 1 - Zhaonan Liu Bio 101 August 23, 2007 Lecture 1...

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Zhaonan Liu August 23, 2007 Bio 101 Lecture 1 “Nothing in biology makes sense except in the light of evolution” - Theodosius Dobzhansky (1900-1975) Evidence of Evolution prior to Darwin (1859) Organisms appear unchanging (uniformitarianism) Literal interpretation of Genesis puts origin of life at 4004 BCE 19th century geologists, e.g. Charles Lyell : earth is much older: Layered rock seen as sediments, deposited gradually. Now, radiometric dating, puts oldest rocks at 4+ billion years. Fossils : Fossils were much older than 4004 BCE Some organisms (clams, turtles) appear unchanged for millions of years Others (horses) leave a complete fossil record of gradual change Finally, some (trilobites, dinosaurs) appear then disappear from earth Modern Biology begins with Darwin (1859) 1. Evidence for evolutionary change 2. The agent for change: natural selection Darwin’s Evidence for Change 1 . Geological evidence : Fossil record contains many organisms that are now extinct that reveal gradual changes over
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This note was uploaded on 02/23/2008 for the course BIO G 101 taught by Professor Gilbert,c. during the Fall '07 term at Cornell.

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Bio notes 1 - Zhaonan Liu Bio 101 August 23, 2007 Lecture 1...

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