3*4 
Journal of Agricultural Research 
Vol. XXV, No. 7 
brachytics 4.5 ±1.2 and of the dwarfs all have perfect flowered ears. 
The distributions are: 
Pistillate 
ears. 
Perfect 
flowered 
ears. 
Total. 
Per cent. 
Normal stature. 
532 
3 
535 
0. 56±o. 22 
Brachytic stature. 
126 
6 
132 
4 - 54 ±i- 2 
Dwarf stature. 
O 
187 
187 
IOO. OO ± 
Total. 
658 
196 
854 
23.0 db • 98 
Combining the brachytic and normal stature groups, which differ only 
slightly in excess of three times the error in the percentage of plants with 
perfect flowered ears, the resulting fourfold distribution is: 
Pistillate 
ears. 
Perfect 
flowered 
Total. 
ears. 
Nondwarf. . 
658 
0 
0 
667 
187 
Dwarf. 
y 
187 
Total. 
6$8 
196 
854 
Looked at as closely linked but distinct characters, Haldane’s P = 0.9888 
with the percentage of crossover 1.12 (6). The expected distribution 
on the assumption of a 1.12 per cent crossover is: 
Expected. 
636.3 
658.0 
4- 2 
0 
4. 2 
0 
209.3 
187. 0 
Observed. 
22. 0 
4. 2 
4.8 
22. 0 
X 2 = 12.75 J this is a rather poor fit, but in this case the departure from 
the Mendelian percentages are being measured also, and there is direct 
evidence that the population has been reduced through the low viability 
of the dwarf plants. With this knowledge, it seems quite fair to calculate 
the expected on the basis of the actual percentage of dwarf plants found, 
since the end result will afford an opportunity to determine whether 
the absence of crossover plants in the dwarf group is of any significance. 
The distributions, taking into account the low percentage of dwarf 
plants, become— 
Calculated. 
661. 1 
6 
3 * 7 
183.3 
Observed. 
658.0 
9 
0 
187.0 
• 
3 - 1 
3 
3 - 7 
3- 7 (x 2 =5- 287.) 
