XU CONTENTS 



Vni. Bacteriophage Genetics by Cyrus Levinthal 281 



I. Introduction 281 



II. Phage Mutations 282 



A. Plaque-Type Characters 282 



B. Host-Range Mutants 284 



III. Recombination 285 



A. Liukage Map 285 



B. Techniques of Phage Crosses 286 



C. Two-Factor Crosses 287 



D. Three-Factor Cross 289 



IV. Multiple Matings in Individual Crosses 290 



V. The Mating Event 293 



A. Reciprocal Recombinants 294 



B. Heterozygotes 296 



C. Radioactive Tracer Experiments 299 



VI. Mating Kinetics 302 



A. General Assumptions 302 



B. Distribution of Mutants 303 



C. Distribution of Recombinants 304 



D. The MatiLg Process 304 



E. Distribution of Recombinants for Close Markers 306 



VII. Fine Structure Genetics 307 



A. The rll System 307 



B. Deletions 308 



C. Function Units 309 



D. Negative Interference 310 



VIII. Phenotypic Variations 311 



A. Phenotypic Mixing 311 



B. Host-Controlled Variation 312 



IX. Conclusion 313 



References 316 



IX. Lysogeny by Francois Jacob and Elie L. Wollman 319 



I. Introduction 319 



II. Historical Development of Lysogeny 321 



A. Discovery and Criteria of Lysogeny 321 



B. Concept of Prophage 321 



III. Detection and Occurrence of Lysogeny 323 



IV. Phage Production by Lysogenic Bacteria 324 



A. Spontaneous Production 324 



B. Induction of Phage Production in Lysogenic Bacteria .... 326 



