The Physical Basis of Heredity (Classic Reprint) Book

THE PHYSICAL BASIS OF HEREDITY CHAPTER I INTRODUCTION That the fundamental aspects of heredity should have turned out to be so extraordinarily simple supports us in the hope that nature may, after all, be entirely approachable. Her much-advertised inscrutability has once more been found to be an illusion due to our ignorance. This is encouraging, for, if the world in which we live were as complicated as some of our friends would have us believe we might well despair that biology could ever become an exact science. Personally I have no sympathy with the statement that "the problem of the method of evolution is one which the biologist finds it impossible to leave alone, although the longer he works at it, the farther its solution fades into the distance." On the contrary, the evidence of recent years and the methods by means of which this evidence is obtained have already in a reasonably short / time brought us nearer to a solution of some of the important problems of evolution thanTable of Contents CONTENTS; CHAPTER PAGE; I Introduction 15; II Mendel's First Law-Segregation of the Genes 19; III The Mechanism of Segregation 39; IV Mendel's Second Law-The Independent Assortment of; the Genes" 59; V The Mechanism of Assortment 73; VI Linkage 80; VII Crossing Over 87; VIII Crossing Over and Chromosomes 96; IX The Order of the Genes 118; X Interference 126; XL Limitation of the Linkage Groups 133; XII Variation in Linkage 139; XIII Variation in the Number of the Chromosomes and its Re-; lation to the Totality of the Genes 147; XIV Sex-Chromosomes and Sex-linked Inheritance 165; XV Parthenogenesis and Pure Lines 204; XVI The Embryological and Cytological Evidence that the; Chromosomes are the Bearers of the Hereditary Units 212; XVII Cytoplasmic Inheritance 219; XVIII Maternal Inheritance 227; XIX The Particulate Theory of Heredity and the Nature of; the Gene 234; XX Mutation 247About tRead More