ON SOME HYBRIDISATION EXPERIMENTS 



181 



tinged stem, II — 9 — 3, was used, and this plant gave by self-fertilisa- 

 tion four plants all of which had white flowers and tinged stems. The 

 results of these crosses are given below in table I, where the figures 

 in the parentheses give the plants that flowered, the other figures being 

 the plants classified on the stem colour. 



TABLE I. 



Thus, in two of these crosses between white-flowered individuals 

 lilac-flowered plants were obtained. The results are thus in accordance 

 with the hypothesis given above, which now can be considered as 

 proved, the segregation in F. following the theoretical 9 : 7 ratio. 



The numbers in table 1 make probable that the plants used in 

 the crosses were of the following genotypic constitutions. 



11—9—3 = Aabb 

 II— 9— 4 = aabb 

 II— 9— 5 = aabb 

 II— 9— 6 = aaBB 

 II— 9— 7 = aaBB. 



The results obtained and the results expected on the basis of these 

 formulas are given in table 11. 



TABLE II. 



