A general payoff matrix for male relatives (M1, M2) for either inbreeding or avoiding inbreeding with a female (F1) of equally close relatedness (r).

Unless both M1 and M2 avoid inbreeding, inbreeding depression (δ) will reduce the fitness of F1’s offspring. If both males avoid inbreeding, for simplicity, F1 is assumed to mate with an unrelated male. F1 is assumed to produce 2 offspring.A general payoff matrix for male relatives (M1, M2) for either inbreeding or avoiding inbreeding with a female (F1) of equally close relatedness (r).除非M1与M2均避免近交，否则近交衰退（inbreeding depression, δ）将会降低F1后代的适合度。若两只雄性均避免近交，为简化起见，我们假定F1将与一只无关雄性交配，且F1可产生2个后代。针对雄性亲属M1、M2分别与亲缘系数为r的雌性F1进行近交或避免近交的场景，本文给出了对应的通用收益矩阵。