PSYCH 3F03 Lecture 3: 3. Social Evolution Theory II

• School: McMaster University
• Department: Psychology
• Course: PSYCH 3F03
• Professor: David Feinberg

Document Summary

A(cid:272)(cid:272)ordi(cid:374)g to ha(cid:373)ilto(cid:374)(cid:859)s rule, spite should(cid:374)(cid:859)t (cid:271)e a(cid:271)le to e(cid:448)ol(cid:448)e, (cid:271)ut (cid:449)e see it i(cid:374) (cid:374)ature: ha(cid:373)ilto(cid:374)(cid:859)s a(cid:374)s(cid:449)er: the a(cid:272)tor & re(cid:272)ipie(cid:374)t are(cid:374)(cid:859)t the o(cid:374)l(cid:455) o(cid:374)es affe(cid:272)ted (cid:271)(cid:455) so(cid:272)ial a(cid:272)tio(cid:374)s. 2 stages of selection: what actor does to itself + recipient, effe(cid:272)ts of a(cid:272)tor/re(cid:272)ipie(cid:374)t"s (cid:272)ha(cid:374)ge i(cid:374) fit(cid:374)ess to (cid:374)eigh(cid:271)ours. Modified equation neighbour in the a(cid:272)tor"s neighbourhood bear the causal allele identical by descent. (cid:2206) = probability that the actor and a random. (cid:2207) = probability that the actor and a random: more likely: r > ; less likely: r < . R = (cid:3300) (cid:2778) (cid:3299) neighbour in the re(cid:272)ipie(cid:374)t"s neighbourhood bear the causal allele identical by descent by descent, relative to their neighbours (cid:2184) (cid:2185)+ (cid:2206)(cid:2185) (cid:2207)(cid:2184)>(cid:2777) How much more likely the recipient bears the same allele as the actor as its neighbours: relatedness: the extend to which the actor & recipient bear the causal allele identical, relative measure no longer a probability.