Table 2.
Distribution of SNP markers among genotype classes for a mapping population of guinea grass (Megathyrsus maximus).
| Marker class | Genotype of the parents | Segregation ratio | Number | DR | NP | Distorted | Mapped |
|---|---|---|---|---|---|---|---|
| Null | AAAA x BBBB | 0 | 0 | 0 | 0 | 0 | 0 |
| Simplex | AAAA x AAAB, ABBB x BBBB | 1:1 | 1,654 | 111 | 125 | 18 | 491 |
| Duplex | AAAA x AABB, AABB x BBBB | 1:4:1 | 334 | 0 | 58 | 40 | 136 |
| Triplex | AAAA x ABBB, AAAB x BBBB | 1:1 | 35 | 18 | 0 | 0 | 17 |
| Double-Simplex | AAAB x AAAB, ABBB x ABBB | 1:2:1 | 226 | 60 | 0 | 5 | 106 |
| X-Double-Simplex | AAAB x ABBB | 1:2:1 | 26 | 16 | 0 | 0 | 9 |
| Simplex-Duplex | AAAB x AABB | 1:5:5:1 | 155 | 38 | 0 | 9 | 72 |
| Duplex-Simplex | AABB x ABBB | 1:5:5:1 | 6 | 0 | 0 | 0 | 1 |
| Double-Duplex | AABB x AABB | 1:8:18:8:1 | 74 | 0 | 0 | 42 | 26 |
| Total | 2510 | 243 | 183 | 114 | 858 |
Significant distortion at (P < 0.001) and (P < 0.01) for simplex and higher-dosage markers. DR corresponds to double reduction, and NP indicates incompatible SNPs with the parental dosages. SNPs with missing data, outliers and duplicates were not considered.