About the Autmor Preface PROLOGUE PART Ⅰ Basic Principles:How Traits Are Transmitted CHAPTER 1 Mendel’s Breakthrough:Patterns,Particles,and Principles of Heredity CHAPTER 2 Extensions to Mendel:Complexities in Relating Genotype to Phenotype CHAPTER 3 The Chromosome Theory of Inheritance CHAPTER4 Linkage,Recombination,and the Mapping of Genes on Chromosomes PART Ⅱ What Genes Are and