PLANT CoLors IN Maize 49 
and is therefore assumed to have been aabbpl pl. All three of the 
theoretically possible homozygous genotypes have therefore been demon- 
strated among the F2 greens or among F';’s comparable to Fy’s. 
In addition to the green plants of the direct F. and F3; generations, 
noted above, fifteen other greens were crossed with dilute sun red. All 
these greens belonged to a single progeny, 2019, which was the result of a 
backeross of an F; purple with a green, aabb pl pl (table 3, group 1). 
All of them should therefore have been heterozygous for B or Pl, or have 
lacked these dominant genes. Seven of the fifteen, when crossed with 
dilute sun red, gave 110 sun red and 85 dilute sun red plants (group 4, 
table 16), a deviation from equality of 12.5 + 4.7. The green parent 
plants. are consequently regarded as aaBbplpl. Five others of the 
fifteen green plants (group 5) gave a total of 56 dilute purple and 65 
dilute sun red, a deviation from equality of 4.5 + 3.7, and hence are assumed 
to have been aabb Pl pl. Three of the fifteen (group 6) gave a total of 
106 dilute sun red plants. These three must, it is supposed, have been 
aabbpl pl. 
Naturally, in the course of the writer’s maize studies, many other 
crosses between green and dilute sun red have been observed. But no 
purpose can be served by presenting here all this mass of data. Much 
of it has accumulated in connection with a study of the interrelations of 
plant and aleurone color, and will find its appropriate place in a later 
publication on that topic. A few F: and backcross progenies of dilute sun 
red Fy’s of such crosses are, however, listed in table 17 (page 134), to serve 
as an indication of the behavior of all. Three F. progenies (group 1, table 
17) contained 269 dilute sun reds and 99 greens, a deviation from the 
expected 3:1 ratio of 7+ 5.6. Five progenies of F, dilute sun reds back- 
crossed to green VIc (group 2) included 357 dilute sun reds and 358 greens, 
a deviation from the expected 1:1 ratio of only 0.5 + 9.0. 
The behavior of a number of the sun red and dilute purple plants listed 
in table 16 has been studied in F, and later generations. . Consideration 
of this later behavior is conveniently deferred to a later section of this 
paper (pages 51 and 53), where it is taken up with other crosses which 
should theoretically give similar results. 
Green x green, VIla, VIb, VIic— A number of green plants of progeny 
2019, discussed above, were intercrossed. That these green plants bred 
true green when selfed was shown by the records of table 15 (groups 3 
