PLANT Cotors IN MaizE 53 
Dilute purple IIIa x green VIc— Since dilute purple differs from sun 
red merely in having the dominant Pl factor instead of B, crosses of dilute 
purple with green of type VIc should behave just as did the crosses con- 
sidered in the preceding section, except that dilute purples take the place 
of sun reds in the progeny. Eight crosses of dilute purple with green of 
type VIc resulted in 91 dilute purple plants. The F. results of these 
crosses are given in table 22, group 1. Since the F, plants of these crosses 
are assumed to have been Aabb Pl pl, the F2 results should be the same 
as those expected from crosses of greens of type VIb with dilute sun reds. 
The Fy’s of the latter crosses have alreaidy been discussed (page 48). The 
F, results, six progenies, are for convenience considered here (group 2, 
table 22). While the expectation of a 9:3:4 relation was not very closely 
realized in the observed results, such deviations as those found might be 
expected thru chance about once in eight trials, P equaling 0.13. The 
comparison of observed and expected distributions follows: 
Dilute Dilute 
Color types anneal iin asl Green Total 
Illa IVa VIb, ec 
Observed: 
IU Dish 5° WAGs Senet ae een 416 149 ae 738 
TINY eh 5% AV 0) 5 ua amar el a 274 102 107 483 
WOU 6 oss Se Rr re - 690 251 280 22) 
Olculaned eres sos cw cc ce sk eles 687 229 305 1220 
| DHIGIRSIONGS = satan eae iene +3 +22 —25 0 
A single F, plant backcrossed with green gave the same three color types 
in the relation 26:20:56. The theoretical distribution is 25.5:25.5:51.0. 
Deviations of the observed order might be expected somewhat more than 
twice in five trials, P equaling 0.44. 
Seven F. greens bred true in F; with a total of 359 individuals. One 
dilute sun red F, plant bred true with a progeny of 156 dilute sun red 
plants. Of the F». dilute purples, some bred true, some threw the three 
types seen in F2, some gave only dilute purple and dilute sun red, and 
some gave only dilute purple and green. Notwithstanding the rather 
poor fit in F2, therefore, the fact that practically all the expected classes 
