Table 2 Origin of genes in each stratum on the Y chromosome
| Â | X ancestral, Y single copy | X ancestral, Y duplicated | Autosomal, Y single copy | Autosomal, Y duplicated | Unknown origin, Y single copy | Unknown origin, Y duplicated | Total |
|---|---|---|---|---|---|---|---|
Stratum 1 | 114 (72.6%) | 14 (9.0%) | 3 (1.9%) | 6 (3.8%) | 19 (12.1%) | 1 (0.6%) | 157 |
Stratum 2 | 154 (80.6%) | 11 (5.8%) | 2 (1.0%) | 11 (5.8%) | 11 (5.8%) | 2 (1.0%) | 191 |
Stratum 3 | 233 (83.8%) | 22 (7.9%) | 3 (1.1%) | 8 (2.9%) | 11 (4.0%) | 1 (0.3%) | 278 |