5. Linkage of sb. Slit blade is probably not on chromosome 6 where first reported:
| Genes | Phase | XY | Xy | xY | xy | Total | % Recomb. |
| Y1 Sb | RS | 930 | 249 | 306 | 84 | 1569 | 50 |
| Pl Sb | RS | 478 | 135 | 154 | 49 | 816 | 48 |
| Su2 Sb | RS | 896 | 265 | 340 | 68 | 1569 | 43 |
| Py Sb | RS | 1165 | 328 | 352 | 68 | 1913 | 50 |
The Y was not certainly, but probably, Y1. In any case, sb is not between Y1 and py.