104 
S. IKENO : 
Of tli3 remaining 2 one lias produced 1 orange besides 13 whites, and another 
nothing but 1 orange ; as discussed in Chapter ‘ Mutations, etc.”, I, I con¬ 
sider both, in spite of such facts, to be the whites of the constitution ccrrbb 
(s. Table VIII, Nos. 12 and 13 ; and discussions about them, p. 124), so that all 
7 white parents here are regarded to be genotypically equivalent, viz. ccrrbb. 
Table TV. 
F 2 -generation (1916, 1917). 
F 1 -parent 
Magenta 
Orange 
White. 
Totals 
Magenta x white-I 
126 
51 
55 
232 
White-I x magenta 
16 
2 
10 
28 
Totals 
142 
53 
65 
260 
Expected 
146-25+7-99 
48-75+6 29 
65+6-98 
260 
F 3 -generation from white-I x magenta (1917). 
Colour of F 2 -parent 
No. of 
selfed 
plants 
No. of Fg-offspring 
Magenta 
Orange 
White 
Totals 
2 
0 
0 
2 
Magenta|. 
1 
Expected 2 
0 
0 
2 
( 3 
0 
1 
4 
Magenta . 
1 
J 
| Expected 3 
0 
1 
4 
5 
4 
0 
9 
Magenta ... . 
1 
Expected 6-75+T3 
2-25±l-3 
— 
9 
84 
27 
28 
139 
Magenta . 
4 
Expected 78T9+5 8 
26-06+4-6 
34-75+5T 
139 
f 0 
48 
0 
48 
Orange. 
5 
Expected 0 
48 
0 
48 
( o 
101 
24 
125 
Orange . 
6 
I Expected 0 
93-75+4-8 
31-25+4*8 
125 
White . 
5 
1 ° 
0 
78 
78 
| Expected 0 
0 
78 
78 
* White . 
1 
1 ° 
1 
13 
14 
( Expected 0 
0 
14 
14 
* White . 
1 
0 
1 
0 
1 
( Expected 0 
0 
1 
0 
t The number of segregates from this magenta parent is so small that it is considered to 
be homozygous on 1 y provisionally. 
