80 



THE AMERICAN NATURALIST [Vol. LIII 



dominant, so that all the blossoms of first generation 

 plants bear < 



TABLE I 



First Generation Plants of Cross Carmii 



Ki-(.iii the .l;ita shown in 'r;il)lrs T and II, it is evident 

 that the characters i)iuk and eaniiine behave as typical 

 unit characters, with carmine completely dominant. 

 Segregation takes place in the 2d generation into carmine 

 and pink blossomed plants very close to the theoretical 

 ratio of 3 to 1. 



A heterozygous plant of the first generation of the 

 cross Pink (Conn. Broadleaf) $ X Carmine <^ was then 

 crossed with homozygous carmine. Of 115 plants ob- 

 tained in this cross, all were carmine in color, which is 

 in accord with the expected result. 



Heterozygous plants of the first generation were now 

 crossed with recessive pink with the following results. 



From tlu's.' ivsnlts it is cvid.Mit that th.- thooivtical 

 ratio 1:1 which obtains in such a cross is v. My ch)s,-ly ap- 

 proached. 



