| Ecotype | Allelic frequency | Genotypic frequency | χ2 | G2 | |||
| A | B | AA | AB | BB | |||
| Fulani | 0.83 | 0.17 | 28 (0.64) | 15 (0.36) | 0 (00) | 1.77 | 2.98 |
| Yoruba | 0.88 | 0.12 | 35 (0.76) | 11 (0.24) | 0 (00) | 0.76 | 1.36 |