moritz8-1 - Bio1B Evolution 8 Last lecture Sexual selection...

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1 Bio1B Evolution 8 Last lecture : Sexual selection Mating systems (pp 1136-7) Intra vs intersexual selection (481-482) Female preference: Direct benefits (resources) vs indirect (good genes) Today Evolution of sacrifice (altruism) What is a species anyway? (Pp. 487-492) – Concepts - typological, biological, phylogenetic – Reproductive isolation - mechanisms – Interesting one - Ensatina salamanders Speciation processes - introduction & geography; adaptive radiations 2 When to sacrifice? - if it helps a relative - lots… [pp 1138-1140] “Kin selection theory” (W. Hamilton) Help if: rB > C: r = %shared genes, B = benefit, C = cost Haldane: “I would not lay down my life for a brother, but would do so for 2 brothers or 8 cousins)” Social insects: inheritance system => higher “r” => increased cooperation Tuco tuco - co- parenting by females in social groups (Eileen Lacey, IB)
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moritz8-1 - Bio1B Evolution 8 Last lecture Sexual selection...

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