CONTENTS 



1 Genetic Material and Mitosis 1 



2 Meiosis and Chromosomal Segregation 75 



3 Segregation of Alleles 31 



4 Independent Recombination by Nonalleles 42 



5 Multiple Alleles; Multigenic Traits 57 

 *6 Phenotypic Effects of Gene Action 69 



7 Sex Chromosomes and Sex-Linked Genes 90 



*8 Sex Determination 102 



9 Linkage and Crossing Over Between Genes 116 



10 Gene Arrangement; Crossover Maps 131 



11 Changes Involving Unbroken Chromosomes 149 



12 Structural Changes in Chromosomes 164 



*13 Radiation-Induced Structural Chromosome Changes 179 



*14 Point Mutations 189 



15 The Gene Pool; Equilibrium Factors 201 



*16 Genetic Loads and Their Population Effects 216 



*17 Chromosomal Rearrangements in Nature 228 



*18 Races and the Origin of Species 241 



19 Chemical Nature of Genes 252 



20 Organization and Replication of DNA in Vivo 265 



21 Replication of DNA in Vitro 279 



22 Clones; Transformation; Strand Recombination in Vitro 292 



23 Bacterial Mutation and Conjugation 306 



24 The Episome F 317 



25 Transduction 330 



26 Bacteriophage; Recombination and Genetic Maps 339 



27 Bacterial Episomes and Genetic Recombination 355 



28 RNA as Genetic Material 363 



