CONTENTS xi 



Allelic Complementation 291 

 Suppression 297 



DNA Base Ratios and Gene Action 299 

 Resume SOO 



11. Genetic control of cell integration :3().5 



Protein Synthesis 30H 



Nucleic Acid Synthesis 31 1 



Genetic Control of Enzyme Formation 321 



Mutations Affecting Rates of Enzyme Formation 334 



Position Effect and ControUinp, Elements 338 



Nuclear Transfer 351 



Concludinf:, Remarks 352 



12. Heredity in somatic cells 356 



Nuclear Differentiation 356 

 Recombination in Somatic Cells 359 

 Somatic Mutation and Selection 370 

 Infectious Heredity 378 

 Phenocopies 380 

 Cell Population Dynamics 382 



13. The summing up 386 



Nature of Hereditary Materials 386 

 Transmission Mechanisms 388 

 Gene Action 389 

 Replication and the Origin of Life 392 



Postscript 397 



Author Index 403 



Subiect Index 407 



