BIOL 2400 Lecture Notes - Lecture 7: Reciprocal Altruism, Inclusive Fitness, Road Rage
12 Sep 2017
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Individuals are surviving and reproducing so it is tempting to think of natural selection as always acting on individuals. Examples of altruism: allogrooming, predator mobbing, co-operative breeding, adoption. Genic selection: dawkins (cid:862) elfish ge(cid:374)e(cid:863) 19(cid:1011)(cid:1010, genes are the stable units of heredity. Evidence of genic selection: alleles co-operate to form a diploid organism because of equal segregation, meiotic drive. Example(cid:198)t haplotype in mice t+ males produce 90% t gametes (t haplotype kills the + sperm) tt is lethal. The t haplotype is favoured by meiotic drive but incurs a cost to the individual. Females given a choice of males with and without the t haplotype: assessed female behavioural preference and paternity of offspring. Yes it can happen but only under certain circumstances. In some cases where groups are very different, isolated and very stable through time. This does not conflict with a genic view of selection: can think of groups as elaborate vehicles for genes.
