Table 3. Comparison of mean observed and expected survival of progeny resulting from crosses and backcrosses to the resistant (Ndja) and susceptible (Moz) parental strains.
| Cross | Number tested (n) | Mean percentage mortality observed | Percentage mortality expected (completely dominant) | Percentage mortality expected (completely recessive) |
|---|---|---|---|---|
| Ndja (RR) | 213 | 61.0±10.2 | ||
| Moz (SS) | 270 | 100±0.0 | ||
| F1 intercross | ||||
| G1 ( SS ♀ × RR ♂) | 168 | 75.0±6.3 | ||
| G2 ( SS ♂ × RR ♀) | 129 | 78.3±5.5 | ||
| Backcross to RR | ||||
| B1 (G1 (♀) × RR (♂)) | ||||
| B5 (G2 (♀) × RR (♂)) | 148 | 27.0±6.0 | 61a | 80.5a |
| B3 (G1 (♂) × RR (♀)) | ||||
| B7 (G1' (♂) × RR (♀)) | 78 | 56.4±3.8 | 61 | 80.5a |
| Backcross to SS | ||||
| B2 (G1 (♀) × SS (♂)) | ||||
| B6 (G2 (♀) × SS (♂)) | 50 | 56.0±4.3 | 80.5 | 100a |
| B4 (G1 (♂) × SS (♀)) | ||||
| B8 (G1 (♂) × SS (♀)) | 38 | 18.4±4.0 | 80.5a | 100a |
| F2 from F1 hybrid intercross | ||||
| Family 3: G1F2 (G1 (♀) × G1 (♂)) | 534 | 72.1±11.0 | 70.75 | 90.25a |
| Family 2: G2F2 (G2 (♀) × G2 (♂)) | 168 | 77.4±8.4 | 70.75 | 90.25a |
Results are expressed 24-h post exposure following exposure to 0.75% permethrin for 1 h.
a
Expected survival significantly different from observed mean survival at P<0.05 using one sample t-test.