B151xF08_L05_OriginOfLife

B151xF08_L05_OriginOfLife - Georgia Tech School of Biology...

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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Origin of Life on Earth Spontaneous generation Greek philosophers to 19th Century Europe Steps in the origin of life Critical role of RNA Evolutionary milestones Three domains of life
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Spontaneous Generation – Early Views Anaximander (ca. 611-547 BCE) Living creatures form in water when acted on by sunlight. The original living organisms differed from those now extant, and humans originated from some kind of fish. Anaximenes (588-524 BCE) The sun’s action on a primordial terrestrial slime made of earth and water led to the formation of plants and animals Anaximander image: http://www.mlahanas.de/Greeks/Bios/Anaximander.html Anaximenes image: http://en.wikipedia.org/wiki/Image:Anaximenes.jpg
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Biology 1510/1511 Georgia Tech School of Biology Fall 2008 Spontaneous Generation – Aristotle Aristotle (384-322 BCE) was the most prominent Greek naturalist. Four terrestrial elements: earth, air, fire, water Organisms derive their properties from the four elements and a vital force (“pneuma”). Described various types of spontaneous generation: Insects generated from dew falling on leaves Bivalves form spontaneously in mud or sand Some fish form like bivalves (i.e., from mud or sand) Image: http://www.philosophypages.com/ph/aris.htm
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This note was uploaded on 09/04/2009 for the course BIO 1510 taught by Professor Unknown during the Spring '07 term at Georgia Institute of Technology.

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B151xF08_L05_OriginOfLife - Georgia Tech School of Biology...

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