101-15-societies & sex online

101-15-societies & sex online -...

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Unformatted text preview: 101-15societies&sexsexual selection•subset of natural selection•BUT just mating success–ignores survival–competition for food–etc.–s.s. can appearto work in opposition to n.s.Sexual Selection•intrasexual selection = competition between members of one sex for access to matesmale-male competition•beachmasterSexual Selection•intersexual selection (mate choice) = choice of mates by one sex based on certain traits of chosen sexmating, morphology & mating systemstypically•females are choosers–males tend to be more ornamented•males are competitors–males tend to be bigger than femaleshave fighting ornaments–females often have no choicewhat do females choose for?•direct benefits= increase #/size/survival of fertilized eggs•indirect benefits= better offspringdirect benefits•female gets better territory, more/better sperm, nuptial gifts, male protects eggs•or female AVOIDS bad males – like STD•can be short-term or long-term benefitindirect benefits•female selects male for his genes•her offspring then have:–better prey capture–predator avoidance–fewer parasites–“sexy son”mate’s genes help offspring be successfulhow do females judge a benefit?...
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This note was uploaded on 04/11/2008 for the course BIO 101 taught by Professor Robinson during the Spring '07 term at University of Miami.

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101-15-societies & sex online -...

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