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Biology Notes 1-23-08 - Biology Notes Primative evolved 1st...

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Biology Notes January 23, 2008 Primative: evolved 1 st relative to something else. If you go back far enough you can map each organism and species on the tree, eventually you will be able to see the connections between each of the above organisms. Three Domains: Endosymbiosis: The endosymbiotic theory concerns the origins of mitochondria and plastids (e.g. chloroplasts), which are organelles of eukaryotic cells. According to this theory, these organelles originated as separate prokaryotic organisms which were taken inside the cell as endosymbionts. Reproduction- Asexual: producing offspring/progeny without gene exchange. Sexual: Producing offspring/progeny with gene exchange. In biodiversity, there are 2 main groups of organisms. -Prokaryotes – no nucleus or membrane bound organelles. -Eukaryotes – have a true nucleus and other membrane bound organelles. *Prokaryotes are considered to be a good example of an evolutionarily sucessful group with asexual reproduction.
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