Contents

Chapters in this book

1. Frontmatter I
2. Preface IX
3. Contents XIII
4. Chapter I. Description and Analysis of Variation Patterns 3
5. Chapter II. Examples of Variation Patterns Within Species and Genera 42
6. Chapter III. The Basis of Individual Variation 72
7. Chapter IV. Natural Selection and Variation in Populations 101
8. Chapter V. Genetic Systems as Factors in Evolution 153
9. Chapter VI. Isolation and the Origin of Species 189
10. Chapter VII. Hybridization and its Effects 251
11. Chapter VIII. Polyploidy I: Occurrence and Nature of Polyploid Types 298
12. Chapter IX.. Polyploidy II: Geographic Distribution and Significance of Polyploidy 342
13. Chapter X. Apomixis in Relation to Variation and Evolution 380
14. Chapter XI. Structural Hybridity and the Genetic System 420
15. Chapter XII. Evolutionary Trends I: The Karyotype 442
16. Chapter XIII. Evolutionary Trends II: External Morphology 476
17. Chapter XIV. Fossils, Modern Distribution Patterns and Rates of Evolution 514
18. Works Cited 563
19. Index 623