1. The al gene is very closely linked to lg1 according to the following data obtained in F2 (repulsion):
| Pedigree NO. | + + | + lg1 | al + | al lg1 | |
| 754- 1 | 108 | 67 | 46 | 0 | |
| - 4 | 151 | 58 | 85 | 1 | |
| - 5 | 103 | 42 | 45 | 0 | |
| - 6 | 131 | 62 | 54 | 1 | |
| - 7 | 196 | 88 | 106 | 0 | |
| - 8 | 114 | 57 | 39 | 0 | |
| - 9 | 180 | 80 | 87 | 0 | |
| -11 | 118 | 46 | 56 | 1 | |
| -18 | 132 | 63 | 47 | 1 | |
| TOTAL | 1233 | 563 | 565 | 4 | |
Crosses involving al, lg1 and gl2 were made this summer (1945-October) in order to get the position of al in relation to lg1 and gl2 in chromosome 2.