MALE GAMETOPHYTIC SELECTION AGAINST A DELETERIOUS ALLELE IN A MIXED MATING MODEL

A deterministic two-allele model is presented for the evolutionary dyn amics of deleterious mutations selected in the male gametophytic stage of a population with mixed selfing and random mating. The equilibrium frequency of the deleterious allele increases with the selfing rate, and the deleterious allele will be fixed, if the selfing rate is suffi ciently high and mutation is unidirectional. The effect of pollen sele ction decreases as the selfing rate increases. Some consequences of ma le gametophytic selection for the evolution of mating systems are disc ussed.