TABLES 



TABLE PAGE 



I. Mendel's seven characters in peas 37 



3. The composition of F2's in peas 3 8 



3. The nine genotypic classes in an F-, segregating for two factors 41 



4. Weights of mother and daughter beans in Johannsen's experi- 

 ments 63 



5. Weights of coloured and white beans in an Fj 72 



6. Effects of the three large chromosomes on hair production in 

 Drosophila 74 



7. The inheritance of height in Antirrhiimm majiis x glutiiiosiim 86 



8. Balanced and unbalanced complements of chromosomes 98 



9. The frequencies of chromosome mutants in tomatoes and newts 99 



10. Primary and secondary chromosome changes 103 



11. Four allelomorphs governing size of eye in flowers o{ Primula 

 sinensis 115 



12. Chromosomes in the pollen of triploid Crcp/5 123 



13. The extra chromosomes in triploid Tulipa and Dattira 125 



14. The fertility of male and female gametes from triploids 126 



15. Chiasmata in Primula kewensis 137 



16. Chromosome numbers in the pollen o£ Primula kewensis 139 



17. The decay of dauermodification in Phaseohis 185 



18. Inheritance of variegation in Scolopcndrium 186 



19. The origin and transmission of viruses 219 



20. Chromosome behaviour and pollen fertihty in Lolium-Festuca 

 hybrids 232 



21. Seed setting in the primrose 249 



22. PoUen competition in Streptocarpus 254 



23. The breakdown of incompatibility in Primula sinensis 255 



24. Chromosome numbers in Poa pratensis 269 



25. Chiasma formation and chromosome pairing in asynaptic maize 289 



26. The geographical distribution of interchanges in Datura 316 



27. Species in Paeonia 322 



28. Frequencies of first cousin marriages in man 347 



29. Percentages of concordance in human one-egg and two-egg 

 twins 349 



30. Tumours in one-egg and two-egg twins 350 



31. Frequencies of affection in relatives of tuberculous individuals 351 



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