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moritz7-1 - Bio1B Evolution 7 Last lecture Evolutionary...

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1 Bio1B Evolution 7 Last lecture : Evolutionary processes Selection Directional selection - expt evidence; genome signatures Coevolution - mutualistic & antagonistic Why have sex - cost of sex, alternatives, proposed advantages Today Sexual selection Mating systems (pp 1136-7) Intra vs intersexual selection (481-482) Female preference: Direct benefits (resources) vs indirect (good genes) Evolution of sacrifice (altruism) 2 Irish Elk (extinct) The things males do…. 3 Intra v inter sexual selection Female choice: manipulation of tail- length in male widowbirds Competition and mating success in male elephant seals Number nests per male A few males dominate reproduction Futuyma, Evolution, 1st Ed. 4 Sperm competition & cooperation in Peromyscus mice (Fisher & Hoekstra 2010 Nature 463:801) Sperm in groups swim faster => fertilization advantage In species with multiple mating ( P. maniculatus ) sperm aggregate with themselves vs sperm from relatives This is not seen in monogamous species (P. polionotus)
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