2. Yellow Endosperm. One selfed ear had 112 deep yellow : 71 pale yellow : 14 white grains, a 9:6:1 ratio which may be interpreted as the interaction of two factors for pale yellow. Tassel-seed-4 was also segregating. The ratios for ts₄ in the three classes suggest linkage of 184 with one of the two pale yellow factors.

It should be possible eventually to identify stocks for the different yellow factors by their linkage with other characters, e.g. ms₁ for Y, al for one chromosome 2, vp for another, etc.