قراءة كتاب Problems of Genetics
تنويه: تعرض هنا نبذة من اول ١٠ صفحات فقط من الكتاب الالكتروني، لقراءة الكتاب كاملا اضغط على الزر “اشتر الآن"
with the particular subjects personal acknowledgments are made.
Dr. F. M. Chapman was so good as to supervise the preparation of the coloured Plate of Colaptes, and to authorize the loan of the Plate representing the various forms of Helminthophila, which is taken from his North American Warblers.
I am under obligation to Messrs. Macmillan & Co., for permission to reproduce several figures from Materials for the Study of Variation, illustrating subjects which I wished to treat in new associations, and to M. Leduc for leave to use Fig. 9.
In conclusion I thank my friends in Yale for the high honour they did me by their invitation to contribute to the series of Silliman Lectures, and for much kindness received during a delightful sojourn in that genial home of learning.
TABLE OF CONTENTS.
| CHAPTER | PAGE | |
| I. | Introductory. The Problem of Species and Variety | 1 |
| II. | Meristic Phenomena | 31 |
| III. | Segmentation, Organic and Mechanical | 60 |
| IV. | The Classification of Variation and the Nature | |
| of Substantive Variation | 83 | |
| Note to Chapter IV | 94 | |
| V. | The Mutation Theory | 97 |
| Note to Chapter V | 116 | |
| VI. | Variation and Locality | 118 |
| VII. | Local Differentiation—continued. | |
| Overlapping Forms | 146 | |
| VIII. | Locally Differentiated Forms—continued. | |
| Climatic Varieties | 164 | |
| IX. | The Effects of Changed Conditions | 187 |
| X. | The Effects of Changed Conditions—continued. | |
| The Causes of Genetic Variation | 213 | |
| XI. | The Sterility of Hybrids. Concluding Remarks | 234 |
| Concluding Remarks | 248 | |
| Index of Subjects | 251 | |
| Index of Persons | 252 |
LIST OF ILLUSTRATIONS.
| Figure | Page | |
| 1. | Tusk of Indian Elephant. | 37 |
| 2. | Jaws of Skates. | 38 |
| 3. | Syndactyly of Human Hand and Foot. | 47 |
| 4. | Syndactyly of the Human Foot. | 48 |
| 5. | Petiole of Begonia |