278 



Shull. 



Table III. 

 Formula: XRF.XbF X XBF.Xbf. 



As all of the 11 broad-leafed males which occurred in the F 2 family 

 were used in these crosses, we are now able to classify that family 

 definitely on the basis of genotypic constitution, and to show that the 

 49 F 2 individuals consisted of 



17 homozygous broad-leafed females, 

 15 heterozygous broad-leafed females, 

 11 heterozygous broad-leafed males, and 

 6 homozygous narrow-leafed males. 



It will be noticed in Table III that the proportions of the sexes 

 are almost completely normal, although the mother -plants for these 

 crosses were included in Table I among those which produced almost 

 no females when crossed with narrow -leafed males. The only striking 

 departure from the expected result, as shown in this table, is the occur- 

 rence of a narrow-leafed female. It is certainly a peculiar circumstance 



