CONTENTS. 



Page. 



Introduction 7 



Dominance and recessiveness 7 



Segregation 8 



Allelomorphism 17 



Law of recombination 18 



Fluctuating variations 23 



Running out of varieties 25 



Selection without artificial crossing 26 



Vegetative propagation 26 



Self-fertilized species 32 



Mass selection 33 



Individual selection 35 



Cross-fertilized species 36 



Hybridization and selection 46 



Vegetatively propagated crops 46 



Self -fertilized species 47 



Cross-fertilized species 53 



Mendelian analysis of heterozygote races 54 



Heterozygote characters 55 



Possibility of entirely new characters 58 



Reciprocal crosses 59 



Evolutionary changes and their relation to plant breeding 59 



Place effect 61 



Non-Mendelian characters 62 



Mutations 64 



Latency 65 



I. Latency due to separation 65 



II. Latency due to dominance of absence over presence 67 



III. Latency due to homozygosis 68 



IV. Latency due to hypostasis (masking) 69 



V. Latency due to inhibition 69 



VI. Latency due to fluctuation : 69 



Correlation 70 



Index 71 



165 5 



