PSYC 3100 Lecture Notes - Lecture 19: Genetic Load, Red Queen Hypothesis, Tas1R1

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Oct 23rd human mating behaviour part 2 (lecture 19) Many species can reproduce asexually (plants, animals) Ex. parthenogenesis (lay egg of its own) Only pass on half one"s dna (cid:894)(cid:272)loning oneself = (cid:1005)(cid:1004)(cid:1004)% offspring will (cid:272)ontain that gene(cid:895: two fold cost of sex. Mate search and competition: benefits must outweight all time, effort and risk involved in mating competition. Those who are preferential in one culture is not for another. Nothing about it is inherently sweet but the reason we do is because we have 2 particular genes to code for receptors that allow us to detect sucrose (tas1r2 and tas1r3 coding for t1r1 and t1r2 receptors) Cats do not detect sucrose because they do not have these receptors. Humans evolved to be attracted to any cue statistically correlated with theses (all else being equal) Humans evolved to be attracted to any cue statistically correlated with these (all else being equal) Each trait valuable because it reflects a fitness-related quality.

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