What is the Fisher runaway (sexy son) hypothesis? Good Genes Hypotheses Hamitton-Zuk Model Deme in e wih Elaborate male traiti may indicete high heritable viablity (Good Genes) Omamert cordion drcemet with ino ed ite ld (nverul Herie vaiioninre e es Tamaledooe la mo me m Fansechoon terele larsl od Females choose mates based on an Indicator of their physiological (and presumably genetic robustness males n ppulnio wih ahigh paramie lond tere wit I gh salective prere fo fore areronce for brigrly cad aamend mal Runaway sexual selection Fisher' s Runaway Process Fisher (1830) suggested how genes controlling femaie preterence could become assooiated with genes controling male traits Genetic varation ina trait arises thatoon fers a survival advantage eg tail lehgth in birds). Males with longer tails are favored by eoological and sexual selection Assume genetio variance for emale preference of tal length Females prefeming longer taled males will confer an advantage to their of fapring Onoe femaie preferene and male raits are genetically associated hey can coevolve Long tail is good - male shows Long tail is good - female prefers it

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