GAMETIC COUPLING AND REPULSION IN THE SILKWORM. 
131 
Actual figures Expectation 
(two matings) 
Moricaud yellow 192 207.4 
Moricaud white 29 17.6 
Plain yellow 22 17.6 
Plain white 57 57.4 
Total 300 300.0 
B. Complete coupling. 
A case of complete coupling between the striped and yellow characters 
was observed in my experiments. These characters showed, as stated above, 
the phenomenon of partial coupling (presumably on 7 : 1 system) on certain 
occasions, while in the present case a complete coupling took place between 
them. Such an inconstancy as regards the intensity of coupling is difficult 
to explain at present. 
Complete coupling between the striped marking (S) and the yellow colour (Y). 
A striped yellow female of the Lot S. 5. ’ll was mated with a “ Brown 
ant ” male (Japanese normal white), and its offspring was reared in 1912. 
The result follows : 
Lot No. h. 19. ’ll 
Striped yellow 215 
• Normal white 188 
Total 403 
Thus all of the striped larvae were yellow, while the normal individuals 
were all white with no exception. 
As the maternal striped yellow (S. 5. ’ll) is heterozygous in the marking 
and colour, as stated before, and the paternal homozygous in both of these 
characters, we have no way of interpretation of the above result except by 
supposing that there occurred a complete coupling between striped and yellow 
