100 R. A. EMERSON 
The seeds from which these plants were grown consisted of colored and | 
colorless in approximately a 3:1 ratio, as is expected when the C factor 
alone is heterozygous. The deviations from the expected 9:3:4 relation 
for plants from colored seeds was such as might occur by chance more than | 
once in three trials, P equaling 0.36, and for plants from colorless seeds 
such as might occur once in six trials, P equaling 0.17. The comparisons 
follow: 
Dilute Dilute 
Plant-color types Green Total 
purple sun red 
Ila IVa IIIg, 1Vg 
Colored seeds: 
@bsenviedsercta ae oer oe 215 58 89 362 
@alculatediee see ae se 204. 68 90 362 
Differences= ee +11 —10 —l 0 
Colorless seeds: 
Observed et. eee 65 Eo 304 129 
Calculated 73 24 32 129 
IDitterenceas eee —§ +8 0 0 
The results presented for plant color alone and in relation to aleurone 
color in these crosses are therefore quite in keeping with the hypothetical 
constitution assigned to the F, plants, namely, A AbbPIplR’R’Ce, 
just as the results from the other crosses were in keeping with the assumed 
genotype AAbbPI pl R’r’CC for their F, plants. 
A single F, plant was backcrossed with green IVg, A b pl R’, with 
results as shown in table 42, group 3. The three color types dilute purple, 
dilute sun red, and green, occurred in the relation 46:45:86. The expected 
distribution for a total of 177 individuals is 44:44:89, showing almost a 
perfect fit, x? equaling 0.21. 
For both the lots of crosses under discussion, further tests are afforded 
by the behavior in F; and Fy. As already shown, some of the F2 dilute 
purples had the same genetic constitution as the Fy plants (table 43, 
groups 1A and 1B). The progenies of two other dilute purples, one of 
F, and the other of an equivalent F3;, produced dilute purple and dilute 
sun red plants only (group 2, table 43), in the relation 82:23. The devia- 
