The three orthogonal contrast scales (W's) for the backcross population
| Genotype | AABB | AABb | AaBB | AaBb |
|---|---|---|---|---|
| G | G22 | G21 | G12 | G11 |
| P | ¼ | ¼ | ¼ | ¼ |
| W1 | ½ | ½ | −½ | −½ |
| W2 | ½ | −½ | ½ | −½ |
| W3 | ¼ | −¼ | −¼ | ¼ |
G's and P's denote the genotypic values and expected genotypic frequencies for the four genotypes of two unlinked genes, A and B.