YOSHIMARO TANAKA 
159 
C 28-4 / i4 241 24 27 56 348 
0 42-2'i4 159 7 12 35 213 
042-3^4 117 8 6 28 159 
Totals 2338 282 212 636 3468 
F a normal yellow from the lots C 26-2 and C 27-1, and F 1 from N6'i4 
were mated inter se, the offspring being reared in the summer of the same 
year. The results follow : 
Norm. yel. Norm. wh. PI. yel. PI. wh. Totals 
C4i-i'i4 68 7 6 19 ioo 
C 4i-2'i4 9 1 1 2 13 
C4i-3'i4 175 — — — 175 
C 42-1' 14 43 2 1 13 59 
C 42-3 2' 14 103 6 12 19 140 
C 42-3' '14 29 2 3 4 38 
Setting aside one uniform normal yellow family, 041-3, and two small lots, 
C41-2 and C42-3, the totals of the rest are 
Norm. yel. Norm. wh. PI. yel. PI. wh. Total 
214 15 19 51 299 
The results of back-crossing are given below. 
PQ,YPqy £ x PqyPqy S 
Normal yellow Plain white Total 
P 64' 1 4 167 [ 17 284 
PqyPqy $ £ x PQYPqy $ $ 
Norm. yel. Norm. wh. PI. ycl. PI. wh. Totals 
P65'i4 119 45 42 99 305 
P66'i4 147 40 33 108 328 
Totals 266 85 75 207 633 
Thus Fj females produced, when crossed with a double recessive, only two 
forms similar to the original parents, while F x males gave four possible forms 
in nearly the ratio 3:1:1:3, the expectation on that basis being 237 : 
79 : 79 : 237. 
