PLANT CoLors IN MaIzE 105 
In one cross there was present the pericarp factor P, which with A gives a 
red and with aa a brown pericarp. All the F2 green plants from colored 
seeds had red pericarp, and of those from colorless seeds the majority had 
brown pericarp. From the colorless seeds there should have occurred 
also a combination type of green, ab pl R’, but no tests were made for 
the identification of this type. 
_ Ten dilute sun reds of F; were tested by their F; behavior. Three 
of these (table 47, group 1) gave dilute sun red and green plants in the 
relation 108:77, a deviation from a 9:7 ratio of 4.0 + 4.6. Five other 
F, plants (group 2) gave the two color types in the relation 187: 66, a devia- 
tion from a 3:1 ratio of 3.0 + 4.6. Two F.’s (group 3) bred true dilute 
sun red, producing 78 dilute sun red and no green offspring. Theoretically, 
of 9 F». dilute sun reds, there should occur in F3, true-breeding, 3:1, 
and 9:7 progenies in the numerical relation 1:4:4. The observed rela- 
tion between these three sorts of behavior for the ten F».’s tested was 
2:5:3. Deviations such as these might occur by chance about once in 
two trials, P equaling 0.49. 
Green IVg x green VIa.— Certain crosses of green IVg with green VI 
have given sun red plants in F;. The type VI greens belonged to families 
in which the B factor was known to be present. They were therefore 
doubtless a B pl plus 7’ or R’, and the Fy’s were probably AaB b pl pl 
plus r’ R’ or R’ R’. — F 2 consisted of the three major color types sun red, 
dilute sun red, and green (table’48, group 1) in the relation 586: 161:348. 
Obviously this is not a 9:3:4 relation, for the deviations from such expecta- 
tion, —30, -44,+74, could not be expected to occur thru errors of random 
sampling once in a million such trials, ~° equaling 30.9 and P equaling 
.000000+. As a matter of fact, an F, of the genotype suggested above 
should give in F, the three color types observed in the relation 36:9: 19. 
The observed frequencies of the several classes fit this expectation so 
closely that the deviations from it might occur by chance in about one 
out of five trials, P equaling 0.19. The comparison of observed and 
expected frequencies follows: 
Color types Sun red pune Green Total 
Ila, g Va TVg, Via; c 
ESET 727g ia ig 586 eli 348 1,095 
eoriea: a 616 154 325 1,095 
WREETENCE. 2... oe coc solos —30 +7 +23 0 
