Introduction to Genetic Analysis 161

Introduction to Genetic Analysis 161 - 160 Chapter 5 The...

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Unformatted text preview: 160 Chapter 5 The Genetics of Bacteria and Their Viruses a a b b d d c c 1 1 2 2 1 b c d a 2 O Direction of transfer E. coli chromosome Hfr Transferred last Transferred first Homologous regions where pairing can take place thr gal pur lac pro thi gly his H thr gal pur lac pro thi gly his thr gal pur lac pro thi gly his thr gal pur lac pro thi gly his thr gal pur lac pro thi gly his thi gly his gal pur lac pro thr 3 gal his gly thi thr pro lac pur 312 gly his gal pur lac pro thr thi 1 pro lac pur gal his gly thi thr 2 lac pur gal his gly thi thr pro Fertility factor Origin (first to enter) Terminus (last to enter) Figure 5-13 Order of gene transfer. The five E. coli Hfr strains shown each have different F factor insertion points and orientations. All strains share the same order of genes on the E. coli chromosome. The orientation of the F factor determines which gene enters the recipient cell first. The gene closest to the terminus enters last....
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