Lecture 1 Bio 320 - 8/27/09 Lecture 1 Biology 320 Top Down...

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8/27/09 Lecture 1 Biology 320 Top Down Approach: looking at DNA sequences and trying to go back to the last universal ancestor to all cells Other approach is to start with chemistry People try to trace back using molecular phylogeny Compare different organisms’ genes: based on a study done by Nobel Prize winner Carl Woese Divided life into 3 large divisions: Bacteria Eukaryotes, Archaea Archea and bacteria are prokaryotes -relatively small and simple organisms -don’t have a complex organization inside, no organelles -usually have cell walls -may make a gooey capsule outside the cell wall Archea are bacteria like -can grow in extreme environments -similar in size (~70S and ~70S) Eukaryotes Complicated internal mechanisms ~80S in size *list some of the things that blocks reproduction etc as listed in the ppt and research them Several problems tracing lineage Example: a base can go from A to C to B and back to A This would cause us to loose a whole history because of these changes Long Branch Attraction
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Lecture 1 Bio 320 - 8/27/09 Lecture 1 Biology 320 Top Down...

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