BLENDING INHERITANCE 



183 



varying doses among these fifteen possibilities, as indi- 

 cated by the numbers in the squares. It is evident, 

 therefore, that several shades of brown will be repre- 



FIG. 39. Diagram to illustrate Nilsson-Ehle's case of trihybrid 

 red wheat. The large screw-heads each represent a single 

 determiner for the red character. The small screw-heads 

 symbolize the absence of the red character, or white. The 

 number in each square indicates how many doses of the "red" 

 determiner is present. For further explanation see text. 



sented depending upon the number of doses of the 

 brown determiner in each instance. 



Figure 38 shows how these different shades of brown 

 arrange themselves in the manner of a frequency curve 

 of fluctuating variation with the greatest number in 



