130 
Y. TANAKA. 
If the above assumption is correct, the Lot M. 7. ’10 must have been 
MmYy x MmYy, and produced the following gametes: 
7 MY, 1 My, l mY, 7 my. 
By recombination of these gametic forms, we should obtain : 
49 MYMY + 14 MYMy + 14 MYmY 
98 MYmy + 2 MymY 
1 MyMy + 14 Mymy 
1 mYmY + 14 mYrny 
49 mymy 
177 moricaud yellow 
. . . 15 moricaud white 
15 plain yellow 
49 plain white 
Our assumption is supported by the results obtained by inbreeding the 
F x phenotypes. 
Four matings of the F, plain white gave 774 F 2 individuals altogether, 
which were all plain white, i. e. remained true to their parents. One 
mating of the plain yellow yielded 136 plain yellow and 54 plain white, or 
approximately the ratio 3 : 1. One of the matings of moricaud white gave 
152 moricaud white and 39 plain white, or nearly the ratio 3: 1. Three 
batches of the moricaud yellow lot produced in all 483 larvae which were 
entirely moricaud yellow. Two matings 
hand, gave four F 2 phenotypes as follows : 
in the same lot, 
on the 
Lot No. 
M. 9.’ ’ll 
M. 9.' ’ll 
Total 
Moricaud yellow 
61 
131 
192 
Moricaud white 
8 
21 
29 
Plain yellow 
5 
17 
22 
Plain white 
10 
47 
57 
Total 
84 
216 
300 
All these results are explicable by the supposed factorial constitution of 
the F! forms and by the assumption that a partial coupling takes place 
between moricaud marking and yellow colour in the heterozygous moricaud 
yellow (MYmy) The experimental figures fairly agree with the numbers 
calculated on the 7 : 1:1:7 basis as shown in the following table. 
