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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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