Table 3. Results from generalized linear model to test for significant effects of genetic background (line), age, locus, and their interactions on crossover frequency using a combined model to test for locus and locus interaction effects.
| Source | df | χ2 | Prob > χ2 |
|---|---|---|---|
| Line | 3 | 23.98 | < 0.001 |
| Locus | 1 | 705.42 | < 0.001 |
| Maternal age | 2 | 7.08 | 0.029 |
| Line × locus | 3 | 6.63 | 0.084 |
| Locus × maternal age | 2 | 7.69 | 0.021 |
| Line × maternal age | 6 | 4.38 | 0.63 |
| Line × maternal age × locus | 6 | 3.59 | 0.73 |
df, degrees of freedom; χ2, chi-square value.