Introduction to Genetic Analysis 155

Introduction to - 154 Chapter 5 • The Genetics of Bacteria and Their Viruses Some Genotypic Symbols Used in Bacterial Genetics Character or

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Unformatted text preview: 154 Chapter 5 • The Genetics of Bacteria and Their Viruses Some Genotypic Symbols Used in Bacterial Genetics Character or phenotype associated Symbol with symbol bio Requires biotin added as a supplement to minimal medium arg Requires arginine added as a supplement to minimal medium met Requires methionine added as a supplement to minimal medium lac Cannot utilize lactose as a carbon source gal Cannot utilize galactose as a carbon source str r Resistant to the antibiotic streptomycin str s Sensitive to the antibiotic streptomycin Note: Minimal medium is the basic synthetic medium for bacterial growth without nutrient supplements. Table 5-1 Figure 5-3 Bacterial colonies on staining medium. The colonies stained red contain wild-type bacteria able to use lactose as an energy source ( lac ). The unstained cells are mutants unable to use lactose ( lac ). [Jeffrey H. Miller.] MODEL ORGANISM Escherichia coli The seventeenth-century microscopist Antony van Leeuwenhoek was probably the first to see bacterial...
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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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