176 Chapter 5 • The Genetics of Bacteria and Their Viruses • Does bacterial recombination resemble eukaryote recombination? Yes, in the sense that AB can be produced from A b and a B . No, in the sense that recombination always takes place in a partial diploid (merozygote) as opposed to a true diploid. Hence the recombination is formally a double-crossover event, needed to maintain the circular bacterial chromosome intact. • Do the genomes of bacterial viruses ever show recombination? Yes, if a bacterial host is infected simultaneously by two phage types, recombinant phage are found in the lysate. • Do bacterial and viral genomes interact physically in any way? Yes, temperate phages can pick up bacterial genome fragments during lysis and transfer them to other bacte-ria when they reinfect. Some phages pick up only one speciFc region; others can pick up any segment that can be stuffed into a phage head. • Can bacterial and viral chromosomes be mapped using recombination? Yes, all bacterial merozygotes can be used for recombi-
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This note was uploaded on 01/10/2011 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.