CONTENTS ix 



g. Sex-linked inheritance 75-80 



in Drosophila ampelophila 75-76 



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 89-98 



2. The Mechanism of Mendelian Heredity 



Discovered in the Behavior of the 

 Chromosomes 98-102 



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 118-142 



a. The Evidence from Sex Linked 



Inheritance 118-137 



