17 BISC_120 Chapter 25 POST

17 BISC_120 Chapter - 1 Cornelius W Sullivan Ph.D Professor AHF 209F [email protected] Office Hours M&W 11:30am to 12:30pm Chapter 25 Part II

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Unformatted text preview: 9/30/2010 1 Cornelius W. Sullivan, Ph.D. Professor AHF 209F [email protected] Office Hours M&W 11:30am to 12:30pm Chapter 25 Part II Summary part I ¡ Conditions on the early earth made the origin of life possible ¡ The fossil record documents the history of life ¡ .H\ HYHQW LQ OLIH¶V KLVWRU\ LQFOXGH WKH origins of single celled organisms Fig. 25-4i Stromatolites 9/30/2010 2 Fig. 25-4j Fossilized stromatolite The dating game ¡ Depends on radiometric dating methods ¡ Radioactive isotopes ¡ Half life Carbon-14 5,730 yrs good to 75,000 yrs Uranium 238yrs 4.5 billion years Strata- Rock sandwich Fig. 25-5 Time (half-lives) Accumulating ³GDXJKWHU´ isotope Remaining ³SDUHQW´ isotope 1 2 3 4 1 / 2 1 / 4 1 / 8 1 / 16 Prokaryote to Eukaryote ¡ Evolution after more than 2 byrs and then over ~ 2 byrs ¡ Serial endosymbiosis ¡ Eukaryote single celled to Multi-cellular Eukaryotes 9/30/2010 2 Fig. 25-4j Fossilized stromatolite The dating game ¡ Depends on radiometric dating methods ¡ Radioactive isotopes ¡ Half life Carbon-14 5,730 yrs good to 75,000 yrs Uranium 238yrs 4.5 billion years Strata- Rock sandwich Fig. 25-5 Time (half-lives) Accumulating ³GDXJKWHU´ isotope Remaining ³SDUHQW´ isotope 1 2 3 4 1 / 2 1 / 4 1 / 8 1 / 16 Prokaryote to Eukaryote ¡ Evolution after more than 2 byrs and then over ~ 2 byrs ¡ Serial endosymbiosis ¡ Eukaryote single celled to Multi-cellular Eukaryotes 9/30/2010 3 Evolution that changed the...
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This note was uploaded on 10/05/2010 for the course BISC 13004 taught by Professor Wetzer during the Fall '09 term at USC.

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17 BISC_120 Chapter - 1 Cornelius W Sullivan Ph.D Professor AHF 209F [email protected] Office Hours M&W 11:30am to 12:30pm Chapter 25 Part II

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