126 
Y. TANAKA. 
But actually such was not the case as shown in the following table. 
Actual figures Expectation on the normal 
gametic distribution 
Striped yellow 
148 
126 
Striped white 
12 
42 
Normal yellow 
14 
42 
Normal white 
50 
14 
Total 
224 
224 
As the experimental result shows a great excess of the normal white, 
we are naturally led to think that a 
partial coupling occurs between stripedness 
and normalness. 
To determine the system on 
which the partial cou] 
pling now under 
consideration occurs the actual numbers observed are not of 
course sufficiently 
large. But it seems to be quite probable that here the 7 
: 1 : 1 : 7 system 
is followed. From the gametic 
series 7 SnY : 1 Sny : 
1 sNY: 7 sNy, 
we may expect F. forms as follows: 
Actual figures 
Expectation on 
Katio on 
7 : 1 basis 
7 : 1 basis 
Striped yellow ]48 
154.9 
177 
Striped white 12 
13.1 
15 
Normal yellow 14 
13.1 
15 
Normal white 50 
42.9 
49 
Total 224 . 224.0 256 
However it must be noted here that there are two another modes of 
explanation for the present case, which are described below. 
i) Suppose that there occur a) a complete repulsion between N and Y, 
and b ) a partial coupling between S and Y on the 7 : 1 system, thus producing 
the gametic series, 7 SnY : 1 SNy : 1 snY' : 7 sNy. Then we should get 
five F 2 forms in the following ratio : 
