igo8] SHULLMENDELIAN INHERITANCE 105 



the offspring should consist of both branched and unbranched indi- 

 viduals in the ratio i : i. 



In the summer of 1905, 59 offspring were reared from this cross, 

 28 branched and 31 unbranched, showing either that branching is 



FIG. 2. Individuals representing two elementary strains of the "Russian" sun- 

 flower; leaves removed to display the branching habit. 



dominant, and the original branched plant was a heterozygote, or that 

 branching is not a Mendelian character. About half of the unbranched 

 plants showed a few weak branches about the base, but none had 

 more than four branches, while none of the branched individuals had 



