Puant Couors IN MAIZE 97 
A second F, plant backcrossed with green IVg, A b pl R’, gave the 
expected four types. The deviations from the equal frequency expected 
for the several types was such as might occur by chance somewhat more 
than once in four trials, P equaling 0.27. The comparison follows: 
_ Color Purple, Purple, Dilute 
types purple anthers green anthers purple Green Total 
Ta Ig Illa IllIg 
| Observed... 59 67 80 7a 283 
Calculated. . 71 71 7 71 284 
Difference.. —12 yh “+49 +6 1 
Dilute purple IIIa x green IVg.—A single cross of dilute purple, 
AbPlir’, with green IVg, Ab pl R’, gave dilute purple, A A 6b Pl pl R’7’, 
in F;, and three phenotypes, dilute purple, dilute sun red, and green, in 
F. (table 42, group 1, page 150). ‘The observed frequencies were 23:8: 10, 
which is the nearest possible approach to the expected 9:3:4 relation for 
‘a total of 41 individuals. One F, dilute purple gave similar results in Fs, 
‘indicating the same genotype as the F; dilute purples. The F; progenies 
‘of this F3; lot may be regarded as equivalent to F3’s, and are therefore 
‘grouped with the F; in table 43. Three F; and Fs progenies (table 43, 
group 1A) approached the 9:3:4 relation so closely that the observed 
deviations might occur by chance in nearly three out of five trials, P 
equaling 0.59. The comparison follows: 
Dilute Dilute 
Color types anal a oe Green — Total 
IIIa IVa IIIg, 1Vg . 
_ OSSIAVGG| Se Rese 143 48 We 264. 
eM wmlarede ete. hn is. ee 149 50 66 265 
OMMETEMCOM mah 6 6.5/50086 6 5 as —6 —2 +7 —1 
Cc 
The green plants of these F; and F, lots, as well as those of the Ws lot 
listed in group 1 of table 42, are assumed to be Ab PIR’ and A bplR’, 
and consequently to differ from the dilute purples and dilute sun reds only 
in having R’ R’ in place of R’r’ or rr’. That the Rr pair is thus con- 
cerned in these results can be shown by a comparison between the plant- 
