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BIO220-Slides-Lecture5-W2012

BIO220-Slides-Lecture5-W2012 - Cooperation Conflict Levels...

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1 Cooperation, Conflict & Levels of Selection
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2 Parent-Offspring Conflict
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3 Parent-Parent Conflict Who will care for the offspring?
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4 Parent-offspring (PO) conflict Parent-parent (PP) conflict A combined PO and PP conflict Parent-Offspring and Parent-Parent Conflict
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5 You want to take more than they want to give Parent-offspring conflict over $$
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6 benefits of you having more: You are richer costs of you having more: Your sibs are poorer If you and your parents weigh these costs and benefits differently, then there will be a CONFLICT Parent-offspring conflict over $$
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7 • Offspring begs for food • Parent provides the food QUESTION 1: How much should OFFSPRING try to get? QUESTION 2: How much should the PARENT provide? Parent-Offspring Conflict
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8 The Trade-Off Provisioning, p Current offspring fitness + Number of future offspring _ B(p) = fitness of current offspring C(p) = # of future offspring “given up” Maximize Benefit - Cost
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9 Offspring (benefits - costs) Benefits B(p) = fitness of current offspring Costs C(p) = # of future offspring “given up” Siblings are genetically related (R=1/2) A gene that causes an offspring to take more resources now will reduce its replication through future siblings Offspring should maximize B(p) - ½ C(p)
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10 All offspring are genetically related (R=1/2) Parent (benefits - costs) Parents should maximize ½
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