301 

 320 



xii Contents 



; ,19(,\ 'Blood Groups 282 



20 Gene Action 

 v^l Interaction of Genes 



22 Quantitative Characters 342 



23 Inbreeding, Selection, and Heterosis 367 



24 Intrachromosomal Aberrations 390 



25 Aneuploids and Nondisjunction 414 



26 Haploids and Autopolyploids 433 



27 Allopolyploids 455 



28 The Origin of Polyploids 47O 



29 The Determination of Sex 480 



30 Cytogenetics and Evolution 516 

 General References 545 

 Specific References 547 

 Author Index 57I 

 Subject Index - 577 



