124 
Y. TANAKA. 
striped yellow parent used in the present cross is produced by combination 
of Sny and snY gametes, but not by that of SnY and sny gametes. 
(Table DI, S. 3. TO, Table V, H. 17. ’ll). 
III. Complete repulsion between stripedness (S) and normal pattern (N). 
While the two preceding cases of repulsion were observed between 
marking character and cocoon colour, the one now to be described below 
occurred between two marking characters. 
The cross (H. 1. TO), homozygous Japanese normal white (Aojiku) ^ 
x heterozygous Chinese striped yellow •£, provided the most interesting 
materials for the present research. As I have already stated, (Repulsion, 
Case 1, b), this cross produced striped and normal yellows in nearly equal 
numbers, and since the zygotic formula of these F, striped yellows (H. 1. 
’ll) is SnYsNy (see Repulsion, Case 1, b and also Table V), it was but 
natural to expect that six F 2 forms would be produced in the following 
ratio : 
27 SNY 
9 SnY / 
36 
striped yellow 
9 SNyl 
3 Sny / 
12 
striped white 
9 sNY 
9 
normal yellow 
3 sNy 
3 
normal white 
3 snY 
3 
plain yellow 
1 sny 
1 
plain white 
Quite contrary to the above expectation only four phenotypes appeared 
in the experiment as shown below : 
Striped yellow 
148 
Striped white 
12 
Normal yellow 
14 
Normal white 
50 
Total 
224 
