PLant CoLors In Maize Rh 
Of any nine F, brown plants of this cross, theoretically one should 
breed true in F3, four should give a 3:1 ratio, and four should give a 9:7 
ratio. Six F.’s were tested, with the results shown in table 20. Two 
bred true, with a total of 29 brown plants (group 1). Two gave ratios 
classed as 3:1, the totals (group 2) being 100 brown to 40 green, a devia- 
tion of 5.0 + 3.5. Two gave progenies interpreted as 9:7 (group 3), 
totaling 39 brown and 39 green, the deviation being 5.0 + 3.9. Of the 
3:1 F; lot, two browns bred true in F:, producing 59 brown plants, and 
one green bred true, producing 56 green plants. 
The distribution of the F, brown plants with respect to their F; behavior 
— two breeding true, two throwing a 3:1 ratio, and two a 9:7 ratio — 
was as near expectation, 1:4:4 in nine, as could perhaps be expected from 
such small numbers. If these six Fz browns are combined with the four- 
teen F, browns of the original cross of purple x green noted earlier in this 
paper (page 44), a very good fit of the hypothesis and observation is found 
(2 = 0.88). Theoretically these two lots of Fz browns should be of the 
same genotypes, so that they may well be so combined. The comparison 
follows: 
F; ratios 1:0 sel 9:7 Total 
Winschycheree so. eS OES. 2 11 7 20 
Solemiateate =e ee PS 2 9 9 20 
Wiiherences 0 LS, ey xe, ats 0 +2 —2 0 
Sun red Ila x green VIc.— When both parents are homozygous, the 
cross of green of type VIc with sun red results in sun red plants only. 
Three such crosses gave 112 sun red plants. Crosses with heterozygous 
sun red plants gave F, progenies of sun red together with dilute sun red 
or green or both, depending presumably upon whether one or the other 
or both of the factors A and B were heterozygous. F sun red plants of 
such crosses are presumed to have the formula AaB b pl pl, and should 
therefore produce in F, the three color types sun red, dilute sun red, and 
green, in the relation 9:3:4. Sixteen F, progenies of such crosses are 
listed in table 21, group 1 (page 136). It has already been shown (page 
48) that crosses of some green plants, a B pl, with dilute sun reds, A 6 pil, 
give sun red F, offspring, which are also assumed to be AaB b pl pl. 
Five F, progenies of such crosses are, for convenience, considered here 
