YOSHIMARO TANAKA 
149 
38 
8q 
08 
/\ 540 1 5 
18 
6r 
44 
I O 
Totals » 
i 5 ° 
142 
6l 
206 
203 
Ratio 
1 
I 
Representing the above 
results by a diagram : 
SSmm x 
ssMM 
Fi 
Gametes 
SmsM 
I 
(Sm, sM) 
ssmm 
(sm) 
r 
1 
Smsm sMsm 
1 : 1 
SmsM SmSm sMsM 
F 3 2:1:1 
The facts given in the preceding lines give an ample proof of the occur- 
rence of complete repulsion between the S and M of SM zygotes in both sexes ; 
thus, individuals homozygous with regard to the presence of both S and M 
are not possible; in other words, no gamete is able to carry over S and M 
simultaneously. 
It must, however, be noted that the present case is open to another expla- 
nation, i. e. by the hypothesis of multiple allelomorphism. Let S, M and R 
denote striped, moricaud and double recessive (e. g. normal or plain) re- 
spectively on the assumption that any gamete bears one and only one of these 
factors, then the factors loaded in each zygote are always two, and the diagram 
above given must be modified as follows : 
SS x MM 
Fi 
Gametes 
sm" 
SM 
(S, M) 
MM 
t 
SR 
RR 
(R) 
MR 
SS 
F.j 2:i:i 1:1 
Multiple allelomorphic relation of hereditary factors was suggested by 
Cuenot as early as 1903, and subsequently various authors have reported 
1) Here occurs >M-Y repulsion approximate to the ratio 1:3:3:1. 
