IV. 1 



IV. 2a 



IV. DEVELOPMENT AND GENETICS 

 KEY 



/ Theoretical problems and general questions 



2 General investigations 

 a General subjects 



b Poly- and heteroploidy 



c Hybridization 



d Chimaerae and mosaics 



e Merogony, including gyno- and androgenesis 



f Nuclear transplantation studies 



g Karyological studies 



h Genetical basis of sex 



3 Effects of genetical factors 



a Specific genes and mutants 

 b Lethal factors 

 c Phenocopies 



4 Methods and techniques 



1 Theoretical problems and 

 general questions 



2 General investigations 



279 



