YOSHIMARO TANAKA 
'55 
As the table shows, neither are normal yellow in F 3 and later generations 
necessarily heterozygous, nor normal white necessarily homozygous, — facts 
that disprove the occurrence of ordinary repulsion between the factors under 
consideration. According to the result obtained by crossing F x with double 
recessive, we may assume the dimorphic gametic series as 
PQY PQy PqY Pqy 
Sperm. 1:3:3:1 
and 
Egg 0:1:1:0 
then F 2 zygotes must be as follows : — 
F 2 phenotypes Their zygotic constitution 
J I PQYPQy 
Normal yellow 8 j6 PQyPqY 
!i PQYPqY 
Normal white 4 1 
1 1 PQyPqy 
Plain yellow ..4 
3 1 1 PqYPqy 
A) F 2 normal yellow yield various F 3 families according to the genetic 
constitution of the individuals mated. 
F 2 matings F 3 families 
Males Females 
Zygotes Gametes Zygotes Gametes Class I 
2 normal yellow 
PQyPqY iPQY: 3 PQy :3PqY: iPqy PQyPqY iPQy: iPqY h normal white 
1 plain yellow 
PQyPqY 1 PQY : 3 PQy : 3 PqY : iPqy PQYPQy iPQY : iPQyj ( Class II 
PQYPQy iPQY: iPQy PQYPQy iPQY: iPQy[] 3 normal yellow 
PQYPQy 1 PQY: i PQy PQyPqY iPQy : 1 PqY J (1 normal white 
PQyPqY 1 PQY : 3 PQy : 3 PqY : iPqy PQYPqY 1 PQY : 1 PqY j Class III 
PQYPqY 1 PQY : 1 PqY PQYPqY iPQY : iPqY ij 3 normal yellow 
PQYPqY 1 PQY : 1 PqY PQyPqY iPQy : iPqY ) ' 1 plain yellow 
