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Fitness of α and β supergenes (presented as α / β ) as a function of their combined strategies (cooperate C or defect D), given complete self-fertilization. x is cost of selfing. c is the cost of α-induced reductions in egg production (shared by both supergenes) and d is the net effect of β-induced increases in egg production (shared by both supergenes).
| β strategy | |||
|---|---|---|---|
| C | D | ||
| α strategy | C | 1-x / 1-x | (1-x)(1+d) / (1-x)(1+d) |
| D | (1-x)(1-c) / (1-x)(1-c) | (1-x)(1-c) / (1-x)(1-c) |
