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Lethality of N−/Nnd-p heterozygotes
| Tester N allele | Tester N allele/Nnd-p | FM7c/Nnd-p |
| N55e11 | 0 | 173 |
| Df(1)N81k1 | 0 | 649 |
| Nco | 0 | 466 |
| N55e11 | 0 | 442 |
| Grand total | 0 | 1730 |
All of the tester N alleles are null mutations. The viability of the N−/Nnd-p females was compared to their FM7c/Nnd-p sisters. If there are no differences in viability, then the two groups should have similar numbers.
