TABLE 7.
Chances of inbreeding and outcrossing in different fungal mating systems
| Mating system | Representative species | No. of alleles in the population (n)a | Chance of inbreeding (%) | Chance of outcrossing (%)b |
|---|---|---|---|---|
| Bipolar-biallelic | C. neoformans | 2 | 50 | 50 |
| Bipolar-multiallelic | C. disseminatus | ∼123 | 50 | 99.2 |
| Tetrapolar-bi/biallelic | Remains to be discovered | 2 (PRL), 2 (HPL) | 25 | 50 |
| Tetrapolar-bi/multiallelic | U. maydis | 2 (PRL), >25 (HPL) | 25 | 50 |
| Tetrapolar-multi/biallelic | Remains to be discovered | >2 (PRL), 2 (HPL) | 25 | 50 |
| Tetrapolar-multi/multiallelic | S. commune | ∼81 (PRL), ∼288 (HPL) | 25 | 98.8 |
| C. cinerea | >200 (PRL), >200 (HPL) | 25 | 99.5 |
a
PRL, pheromone/receptor locus; HPL, homeodomain protein locus.
b
n − 1/n. In tetrapolar mating systems, the smaller number between the pheromone/receptor alleles and homeodomain protein alleles determine the chance of outcrossing.