828 
Journal of Agricultural Research 
Vol. XXIV, No. lo 
Tabi^S VIII.— GradmXMummy and Gradus rogueXMummy in the Fo generation 
(aaXAA) 
TYPBX MUMMY 
AA, Aa. 
aa. 
Total. 
Observed. 
563 
75.88 
75.00 
0.88 
1.17 
0.75 
179 
24.12 
25.00 
0.88 
a 742 
Percentage found. 
Percentage expected. 
Difference (D). 
Standard error (S. K.). 
D/s. E... 
ROGU^X MUMMY 
Observed... 1 . 
1178 
76.79 
75.00 
1.79 
•74 
2.41 
356 
23.21 
25.00 
1.79 
i »534 
Percentage found. 
Percentage expected. 
Difference (D). 
Standard error (S. E.). . . ... 
D/s. E. 
® Data from 25 Fs families including 2 families (34 plants) classified as to color segregation and measured 
for ratio of width to length of stipule but not classified as to stipule shape, i. e., as types or intermediates. 
RFbATlON OP COI.OR PACTORS A AND C 
The Fj plants of Gradus type X Mummy were all purple-flowered. 
The F2 generation gave the expected recombinations in approximately 
the proportion 56.25 per cent purple (with factors A, B, and C), 18.75 
per cent pink (with factors A and B), and 25.00 per cent white (with 
factors aa), the observed number in each class being in sufficient agree¬ 
ment with that theoretically expected when two factors are independ¬ 
ently inherited (Table IX). 
Tabi^E IX. —Segregation of factors for flower color in Fg generation of cross Gradus with 
Mummy and of Gradus rogue with Mummy {actBBCCXAABBcc) 
Observed. 
Percentage found . . 
Percentage expected 
Difference. 
x2=2.8854. 
P==-3405- 
GRADUS X MUMMY 
Purple 
ABC. 
Pink 
ABc. 
White 
aBc, aBC. 
406 
54.72 
36-25 
1-53 
157 
21.16 
i 8-75 
2.41 
179 
24. 12 
25.00 
.88 
Total. 
742 
Observed. 
Percentage found. . . 
Percentage expected 
Difference. 
x2=3‘022S. 
GRADUS ROGUE X MUMMY 
873 
305 
356 
i»534 
56.91 
19.88 
23.21 
56-25 
18.75 
25.00 
.66 
1-13 
1.79 
