s section are remi- niscent of adaptive dynamics (Nowak and Sigmund, 1990; Hof- bauer and Sigmund. 1990; 0ieckmann and Law. 1996; Metz et al.. 1996; Geritz et al., 1998). which is usually formulated for asexual and haploid models. The analysis in this section applies both to the case of small phenotypic effe