Prant CoLorRs IN Maze 55 
(page 138) totaled 998 sun red and 314 dilute sun eel a deviation from 
the 3:1 ratio of 14 + 10.6. 
_ Fourteen backcrosses of F, sun red plants with dilute sun reds (group 2, 
table 24) resulted in 811 sun reds and 742 dilute sun reds, a deviation 
from the expected equality of 34.5 18+.3. 
Two F, dilute sun reds bred true in F3 as expected (table 25, group 1), 
with a total of 50 dilute sun red offspring. Two F, sun red plants (group 2) 
gave a total of 19 sun reds in F3, and a third F: plant, on backcrossing 
with dilute sun red, gave 101 sun reds. Four other F2 sun red plants 
gave both sun reds and dilute sun reds in their F3 progenies (group 3), 
the respective numbers being 373 and 127; the calculated numbers are 
375 and 125, respectively, showing a deviation of 2+ 6.5. Of the seven 
F. sun reds tested, four were heterozygous and three apparently 
homozygous for the B factor. On the whole, therefore, the crosses of 
sun red with dilute sun red behaved approximately as expected. 
Dilute purple Illa x dilute sun red IVa.— Five crosses of dilute sun 
red with dilute purple gave a total of 344 F,; plants, all dilute purple. 
Since these F';’s are supposed to be heterozygous for the Pl factor only, 
a 3:1 F, distribution of color types should result. Seven F. progenies 
listed in group 1 of table 26 (page 139) had a total of 261 dilute purple 
and 87 dilute sun red plants, exactly a 3:1 relation. Five F, plants were 
backcrossed with dilute sun red (group 2) and resulted in 275 dilute 
purples and 263 dilute sun reds. The deviation from the theoretical 1:1 
relation is 6 + 7.8. 
Only two F, dilute purples were tested by their F; behavior. Neither 
bred true, the total produced being 38 dilute purples to 17 dilute sun reds, 
a deviation from the 3:1 ratio of 3.3 +2.2. As far as they go, then, 
the results are in close agreement with what is expected of the crosses 
here under consideration. 
Sun red Ila x dilute purple IIla.— Theoretically, crosses of sun red, 
A B pl, with dilute purple, A b Pl, should give purple, A B Pl, in F,. 
Two crosses, as shown in group 1 of table 27 (page 140), gave a total of 
24 purple and no other types. Here the parents were doubtless 
homozygous. If one or the other of the parents is heterozygous, two 
color types are to be expected in F;. A single cross (group 2, table 27) 
gave 74 purple and 75 sun red plants. Such a result is to be expected when 
the sun red parent is homozygous, A A B B pl pl, and the dilute purple 
parent is heterozygous, A A bb Pl pl. Two other crosses (group 3) gave 
