CHAPTER III

THE FACTORIAL THEORY OF HEREDITY AND THE COMPOSITION OF THE GERM PLASM

1. THE CELLULAR BASIS OF ORGANIC EVOLUTION AND HEREDITY 89-98

2. THE MECHANISM OF MENDELIAN HEREDITY DISCOVERED IN THE BEHAVIOR OF THE CHROMOSOMES 98-102

3. THE FOUR GREAT LINKAGE GROUPS OF DROSOPHILA AMPELOPHILA 103-118 a. Group I. 104-109 b. Group II. 109-112 c. Group III. 112-115 d. Group IV. 115-118

4. LOCALIZATION OF FACTORS IN THE CHROMOSOMES 118-142 a. The Evidence from Sex Linked Inheritance 118-137 b. The Evidence from Interference 137-138 c. The Evidence from Non-Disjunction 139-142

5. HOW MANY GENETIC FACTORS ARE THERE IN THE GERM-PLASM OF A SINGLE INDIVIDUAL? 142-143

6. CONCLUSIONS 144