YOSHIMARO TANAKA 
147 
It has been stated in my previous papers and elsewhere in the present, 
that the factors S and M are alternative to their recessives s and m respectively. 
Now, in inbreeding SmsM individuals, four possible combinations, — SM, Sm, 
sM and sm in the ratio 9:3:3:1 are expected, provided that S anclM be 
independently transmitted. But this was, in reality, not the case. 
H 27-1 '13 striped white x H 56 / i 3 moricaud white 
(SSmmyy) (ssMmyy) 
( ; 1 
Striped-moricaud white Striped white 
(SmysMy) (Smysmy) 
N 7 r i4 246 1 24 
f . r 1 
Striped-moricaud Striped Moricaud 
white white white 
(SMy) (Smy) (sMy) 
A37'i5 73 59 31 
Parents doubtful (perhaps SsmmYY x ssMmYY) 
f . • I. I \ 
Striped-moricaud Striped Moricaud Normal 
yellow (SMY) yellow (SmY) yellow (sMY) yellow (smY) 
O i-4'i4 64 77 73 59 
1 , 
I I I 
Str. mor. yel. Str. yel. Mor. yel. 
(SMY) (SmY) (sMY) 
A 43^5 144 59 67 
F 2 forms SM, Sm and sM came forth nearly in the ratio 2:1:1 (actual 
numbers 217 : 118 : 98), and no individual of sm constitution was produced at 
all. Such a zygotic series is possible only when a complete S-M repulsion 
occurs in one or both sexes. In order to test the male and female gametic 
series separately, the heterozygous striped-moricaud were crossed with double 
recessives reciprocally ; the resulting generation involved only the two pheno- 
types, striped and moricaud, but no other forms. 
