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| Phenotype | Relative fitness |
| TN | 1+σ 1 |
| Tn | 1+σ 2 |
| tN | 1 |
| tn | 1 |
The relative fitness of individuals carrying the T trait can differ from that of individuals carrying the t trait. The amount of this difference is dictated by the N state: the N trait confers a fitness difference of σ 1 between TN and tN, and the n trait confers a fitness difference of σ 2 between Tn and tn.
