CHAPTER II. The Bearing of Mendel's Discovery on

THE BEARING OF MENDEL'S DISCOVERY ON THE ORIGIN OF HEREDITY CHARACTERS

1. Mendel's First Discovery--Segregation 41-52

2. Mendel's Second Discovery--Independent Assortment 52-59

3. The Characters of Wild Animals and Plants Follow the Same Laws of Inheritance as do the Characters of Domesticated Animals and Plants 59-84 a. Sexual Dimorphism 61-64 Eosin eye color of Drosophila 61-62 Color of the Clover Butterfly, Colias philodice 62-63 Color of Papilio turnus 63 Color pattern of Papilio polytes 63-64 b. Duplication of parts 65-66 Thorax of Drosophila 65 Legs of Drosophila 65-66 c. Loss of characters 66-68 "Eyeless" of Drosophila 66-67 Vestigial wings of Drosophila 67 Bar eye of Drosophila 67-68 d. Small changes of characters 68-70 "Speck" 68 Bristles of "club" 70 e. Manifold effects of same factor 71 f. Constant but trivial effects may be the product of factors having other vital aspect 73 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