101-15-societies & sex online

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

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101-15 societies & sex
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sexual selection subset of natural selection BUT just mating success ignores survival competition for food etc. s.s. can appear to work in opposition to n.s.
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Sexual Selection intrasexual selection = competition between members of one sex for access to mates
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male-male competition beachmaster
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Sexual Selection intersexual selection (mate choice) = choice of mates by one sex based on certain traits of chosen sex
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mating, morphology & mating systems typically females are choosers males tend to be more ornamented males are competitors males tend to be bigger than females have fighting ornaments females often have no choice
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what do females choose for? direct benefits = increase #/size/survival of fertilized eggs indirect benefits = better offspring
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direct 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 benefit
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indirect 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 successful
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how do females judge a benefit?
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