CONTENTS 



PART I 

 Fundamentals 

 CHAPTER I 



THE METHODS AND SCOPE OF GENETICS 



PAGE 



Introductory 1 



Genetics defined 1 



Content of genetics 1 



Variation and Heredity defined 3 



The problems of genetics 4 



The methods of genetics 4 



Prerequisites for genetics 10' 



The application of genetics 11 



Genetics in agriculture 12 



CHAPTER II 



VARIATION 



Introductory 14 



Darwin and variation 14 



The universality of variation 14 



The variation concept 15 



Classification of variations 15 



Variation and development 20 



Variation and environment 21 



CHAPTER III 



THE STATISTICAL STUDY OF VARIATION 



Introductory 32 



Causes of fluctuations 32 



Law of statistical regularity 32 



Law of deviations from the average 34 



The normal curve and its significance 34 



Requirements of biometrical study 36 



Biometrical terms 37 



Requisites to reliability 37 



Grouping variates frequency table 38 



Frequency graphs 39 



The mean, standard deviation and coefficient of variability 41 



Theory of error 44 



ix 



