CONTENTS 



PART ONE 



FORMAL GENETICS 



CHAPTER PAGE 



I. The Fundamentals of Mendelism 29 



1. Biological inheritance; genotype and phenotype 29 



2. Mendel's first law 30 



3. Mendel's second law 32 



4. The chromosome theory 33 



5 . Behaviour of chromosomes 



(a) Mitosis 34 



(fe) Meiosis 35 



6. Chromosomes and factors 



(a) The individuahty of the chromosomes 38 



{b) The permanence of the chromosomes 39 



(c) The mechanism of segregation 44 



7. Independent assortment and Unkage 46 



8. The additive theorem of linkage values. 49 



II. Modifications of the Chromosome Cycle 52 



A. CHROMOSOME CYCLES 



1. Inheritance in the haploid phase 53 



2. Haploid heredity of higher plants 55 



3. Endosperm characters 57 



4. Haploid phase characters in animals 58 



B. APOMIXIS 



1. Parthenogenesis 59 



(a) Diploid parthenogenesis, apospory and apogamy 60 



(b) Haploid parthenogenesis 61 



2. Pseudogamy and male parthenogenesis 62 



3. The production of imreduced gametes 63 



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