No. 594] BLENDING AND MENDELIAN INHERITANCE 331 



the middle class. When the F 2 families are treated in 

 this way we find the distribution of white-flowering and 

 red-flowering plants shown in Table 5. 



TABLE V 



Distribution op White- and of Red-Flowering among the F a Plants 



Hoshino uses his F 2 tables as a basis for calculating the 

 strength of the coupling between earliness and flower 

 color, and concludes that the coupling is approximately 

 7 : 1. If, however, F 2 is divided as in Table 5, the coup- 

 ling appears to be less strong, probably about as 4 : 1 or 

 5:1. The percentages of white-flowered plants expected 

 in each group on various integral coupling ratios are as 

 follows: 



It will be observed that the percentage of white-flowered 

 plants in the early group indicates about a 6:1 coupling 

 ratio, but in the medium group, it indicates a 5:1 ratio, 

 while in the late group it would indicate a 3:1 ratio. 

 Much uncertainty exists as to the classification of many 

 of the F 2 plants as regards flowering time, because of 

 irregular and delayed germination. Undoubtedly the 

 classes early, medium and late overlap, so that not much 



