1 64 GENETIC STUDIES ON THE SILKWORM 
Moricaud white Plain yellow Totals 
(MPQy) (mPqY) 
Ex 2-/14 J 64 164 328 
A 493'i5 357 386 743 
(3 batches) 
Totals 521 550 1071 
Expect. 535.5 535.5 1071.0 
Complete repulsion took place in the female hybrid, as shown by the fact 
that no other combinations than two parental types were produced. 
mymy £ x MymY £ 
a) A diheterozygous male mated to a normal white female. 
(mPQymPQy x MPQymPaY 
Mor. yel. 
Mor. wh. 
Norm. yel. 
Norm. wh. 
Total 
D 5-i'l 4 
33 
[23 
142 
37 
335 
b) diheterozygous ma 
es (ex light 
normal yellow x moricaud 
white) 
mated to plain white females. 
(mPqymPqy 
x MPaymPdY) 
Mor. yel. 
Mor. wh. 
Norm. yel. 
Norm. wk. 
Totals 
A 491/15 
29 
143 
'54* 
34" 
360 
A 492'! 5 
24 
187 
187 * 
33 * 
431 
Totals 
53 
330 
341 
67 
791 
Grand totals 
86 
453 
483 
104 
1 126 
(mymy$ xMymY 
t) 
1 12.6 
450.4 
450.4 
1 1 2.6 
1 1 26.0 
(■ 
: 4 
: 4 : 
O 
Expect. i 
94 
469 
469 
94 
1 126 
v (1 
: 5 
: 5 : 
1 ) 
B. M-Y Coupling. 
In the heterozygotes produced by crossing moricaud yellow and normal 
or plain white, a coupling between M and Y takes place, as I have described 
in a previous paper of mine ([913 b). The reported cases are reproduced in 
Table II. 
