Introduction to Genetic Analysis 175

Introduction to Genetic Analysis 175 - 174 Chapter 5 The...

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Unformatted text preview: 174 Chapter 5 The Genetics of Bacteria and Their Viruses particles that now carry a nearby gene and leave behind some phage genes [see Figure 5-31b(ii)]. The resulting phage genome is defective because of the genes left behind, but it has also gained a bacterial gene gal or bio . These phages are referred to as l dgal ( l-defective gal ) or l dbio . The abnormal DNA carrying nearby genes can be packaged into phage heads and can infect other bacteria. In the pres- ence of a second, normal phage particle in a double infec- tion, the l dgal can integrate into the chromosome at the l attachment site (Figure 5-31c). In this manner, the gal genes in this case are transduced into the second host. 5.6 Physical maps versus linkage maps Some very detailed chromosomal maps for bacteria have been obtained by combining the mapping techniques of interrupted mating, recombination mapping, transforma- tion, and transduction. Today, new genetic markers are typically mapped first into a segment of about 10 to 15...
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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.

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