110 



Shull. 



Table IV (continued). 



Aofaiii expectation has been fully realizc(J in that the families in 

 this table fall clearly into the two anticipated g-roups. The highest 

 ratio in the second or heterozygous group is 4'79 : 1 and the lowest 

 1"97 : 1, and both these ratios are within tlie theoretical range of 

 families of the size dealt with in these studies and having a chance 

 distribution about the expected ratio 3:1. if tlie number of families 

 tested were large enough, there should lie in the second group twice 

 as may families as in the first group. Of the Hii families here included 

 the exp((cted numbers in the two classes are i;i and 26 respectively 

 instead of 8 and ;il as actually found. In niinihcrs so small as these, 



') A second sowing from same lot of seeds that priHhiced the preceding family. 



