300 



PLANT HYBRIDIZATION BEFORE MENDEL 



TABLE I 



Male gametes 

 D 



D 



Female 

 Gametes 



In this table we therefore see four kinds of gametes formed in 

 the hybrid zygote of the F^ generation. Let this hybrid be self- 

 fertilized, and we have, of course, each of the four types of male 

 gametes uniting with each of the same four types of female 

 gametes. The process may then be reproduced by a sixteen-square 

 table as follows : 



AB 



TABLE II 



Male gametes 

 aB 



Ab 



ab 



Female 

 gametes 



AB 

 aB 

 Ab 

 ab 



So far as appearances go, the plants resulting from these six- 

 teen combinations would be as follows : 



TABLE III 



