1924] 



Collins: Inheritance in Crepis capillaris (L.) Wallr. 



255 



was the hybrid between these two races. The parent plant from the 



English race was smooth, while the parent from the Danish race had 



rib hairs. 



TABLE 5 



Showing F, and F^ Eesults from the Cross SSS'S', SSs's', and SsS's' 



WITH sss's' 



The 3 to 1 ratio obtained in 19.111 indicates that the rib-haired $ 

 used was heterozyg^ous for the duplicate genes for rib hairs. This 

 cross, as regards these characters, was a back cross of a heterozygote 

 to the recessive parent, and constitutes additional evidence to sub- 

 stantiate the duplicate gene interpretation given above for the inherit- 

 ance of rib hairs in these cultures. 



