Bacterial Reproductio1

Bacterial Reproductio1 - (colony) it comes in contact with....

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Bacterial Reproduction Prokaryotes are much simpler in their organization than are eukaryotes. There are a great many more organelles in eukaryotes, as well as more chromosomes to be moved around during cell division. The typical method of prokaryote cell division is binary fission , shown in the animated GIF below as well as in Figure 10. The prokaryotic chromosome is a single DNA molecule that first replicates, then attaches each copy to a different part of the cell membrane. When the cell begins to pull apart, the two chromosomes thus are separated. Following cell splitting ( cytokinesis ), there are now two cells of identical genetic composition (except for the rare chance of a spontaneous mutation ). One consequence of this asexual method of reproduction is that all bacterial cells in a colony are genetically the same. When treating a bacterial disease, a drug that kills one bacteria of a specific type will normally kill all other members of that clone
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Unformatted text preview: (colony) it comes in contact with. Evolution requires genetic variation on which to operate. How then can bacteria increase their genetic variation if their typical mode of reproduction produces clones? Bacteria can accomplish genetic recombination in three ways. Conjugation, shown in Figures 11 and 12, is the process where one bacterium passes DNA to another through a tube (the sex pilus) that temporarily joins the two conjugating cells. Conjugation occurs only between bacteria in same or closely related species. Transformation involves a bacterium taking up free pieces of DNA secreted by live bacteria or released by dead bacteria. into the surrounding environment. Recall that Griffith's experiment demonstrated this process. The third process, transduction, happens when bacteriophage transfer portions of bacterial DNA from one cell to another....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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Bacterial Reproductio1 - (colony) it comes in contact with....

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