64 Plant Genetics 



ratio of 15: i; but in addition to this, among the 15 reds 

 there could be distinguished varying degrees of redness. 

 NILSSON-EHLE suspected that 15:1 meant a dihybrid 



FIG. 14. Diagram illustrating NILSSON-EHLE'S explanation of 15: i 

 ratio obtained in F 2 generation from cross between red-grained and 

 white-grained wheat. 



ratio, 1 6 individuals being necessary to give the ratio, 

 so that he constructed the tentative scheme shown in 

 fig. 14. 



