CONTENTS ix 



g. Sex-linked inheritance 73-80 



in Drosophila ampelophila 73-76 



in the wild species D. repleta 76 



in man 77 



in domesticated Fowls 77-78 



in the wild moth, Abraxas 78-80 



h. Multiple allelomorphs 81-84 



in the wild Grouse Locust 81-83 



in domesticated mice and rabbits .... 83 



in Drosophila ampelophila 84 



4. MUTATION AND EVOLUTION 84-88 



CHAPTER III 



THE FACTORIAL THEORY OF HEREDITY 



AND THE COMPOSITION OF THE 



GERM PLASM 



1. THE CELLULAR BASIS OF ORGANIC EVOLUTION 



AND HEREDITY 89-99 



2. THE MECHANISM OF MENDELIAN HEREDITY 



DISCOVERED IN THE BEHAVIOR OF THE 

 CHROMOSOMES 99-102 



3. THE FOUR GREAT LINKAGE GROUPS OF DROS- 



OPHILA AMPELOPHILA 103-118 



a. Group 1 104-109 



b. Group II 109-112 



c. Group III 112-115 



d. Group IV 115-118 



4. LOCALIZATION OF FACTORS IN THE CHROMO- 



SOMES 1 1 8-142 



a. The Evidence from Sex Linked 



Inheritance.. .118-137 



