A GENETICO-PH Y SIOLOGICAL STUDY ON THE FORMATION ETC. 
57 
Reddish brown 
Brown 
Total 
Observed 
69 
19 
88 
Expected 
66 
22 
88 
Diff. (ob.-exp.) 
+ 3.0 
-3.0 
Tlie hybrid between “ Kari-mame ” and “ Akadzuka ” in which the 
yellow and reddish brown were crossed, produced the yellow in the F L plant, 
and in F 2 , the following segregation was observed. 
Table 27. 
Showing the result obtained in the iO of the cross 
“ Kari-mame ” x “ Akadzuka.” 
Plant No. 
Green 
Yellow 
Black 
Brown 
Reddish 
brown 
Total 
I 
57 
29 
14 
6 
4 
110 
II 
21 
11 
7 
— 
4 
43 
78 
40 
21 
6 
8 
153 
Expect. 
86.062 
28.687 
28.687 
7.172 
2.391 
Probable error 
±4.139 
±3 256 
±3.256 
±1.763 
±1.014 
DifE. (ob.-exp.) 
-8.062 
+ 11.313 
-7.687 
-1.172 
+5.609 
The expected ratio is 36 :12 : 12 : 3 :1. Here again the deeper brown 
is shown to be recessive to lighter brown. A more detailed analysis of the 
brown characters is under way, and the result will be reported as data 
become available. 
Speaking in general, the inhibited colour of the seed coat can be 
guessed by the colour of the liilum and that of the narrow ring around it. 
In the present communication, the colour of the hilum and the ring is not 
considered. 
3. An Interpretation of the Results. 
It is a well known fact that there are at least two groups of genes 
