ility around - 1/3: (d) P -OA. CI -02. C2 - - 018, corre- sponding to an intermediate level of policing around Z. w 0.7986.... branching may occur; Gen tz et al.. 1998) To determine if (17) is an ESS. we must look at second-order terms in (12) and (14). For a dominant police allele, we return to (12) wit