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Unformatted text preview: The recipient cell is now called a recombinant cell. TRANPOSONS These are small segments of DNA that can move from one region of a DNA molecule to another. They may move from one site to another on the same chromosome, or to another chromosome or a plasmid. Transposition is relatively rare, but it does occur in all organisms. Simple transposons are also called insertion sequences. They contain only: • A gene that codes for the enzyme transposase, which catalyzes cutting and resealing DNA • Recognition sites--short inverted repeat sequences of DNA that the enzyme recognizes as recombination sites between the transposon and the chromosome More complex transposons may carry additional genes not connected with the process of transposition. In bacteria, these may contain genes for antibiotic resistance of production of toxins. Plasmids may be made up of a collection of transposons....
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- Fall '09
- DNA, GENETIC RECOMBINATION