14. Sexual Selection and Sex Conflict - Student Handout

14. Sexual Selection and Sex Conflict - Student Handout -...

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Sexual Selection and Sexual Conflict Spring 2009
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Some Questions We Will Try to Answer! Why are deadbeat moms more common in fish and frogs? The evolutionary origins of the penis! Why are female funnel web spiders in such a bad mood all the time? Why do water striders copulate for 3 months at a time? What the hell is this thing?
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While Darwin’s theories of natural selection explained differences in traits between species… Sexual dimorphisms, or differences between males and females of the same species, could not be explained. Survival components of fitness should not drive these differences.
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Sexual Selection a struggle between individuals of the same sex, generally the males, for possession of the other sex ” – 1859 the advantage which certain individuals have over others of the same sex and species solely in respect of reproduction ” – 1871 To this we add mate choice
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Types of Sexual Selection Two main types: Inter and Intrasexual selection Intersexual Selection – usually _______ Intrasexual Selection – usually _______
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Why are Females More Choosy? assymetrical parental investment Trivers 1972
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Last Custody Dawkins and Carlisle (1976) – the first sex with the opportunity to abandon offspring will lave the other sex in a “cruel bind” But, not all predictions of this hold true.
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What determines fitness for each sex? Males are most often
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14. Sexual Selection and Sex Conflict - Student Handout -...

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