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| Modern Genetic Analysis Chapter 9. The Genetics of Bacteria and Phages Transduction Figure 9-23. Specialized transduction mechanism in phage l . (a) The production of a lysogenic bacterium takes place by crossing-over in a specialized region. (b) The lysogenic bacterial culture can produce normal l or, rarely, an abnormal particle, ldgal, which is the transducing particle. (c) Transduction by the mixed lysate can produce gal+ transductants by the coincor-poration of ldgal and a l helper phage or, more rarely, by crossovers flanking the gal gene. The blue double squares are bacterial integration sites, the red double squares are l integration sites, and the pairs of blue and red squares are hybrid integration sites, derived partly from E. coli and partly from l .

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