2011 Lect 17 Trade offs adaptations and mechanisms of evolution

2011 Lect 17 Trade offs adaptations and mechanisms of evolution

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Trade offs, adaptations and echanisms of evolution mechanisms of evolution
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Evolutionary trade offs $$$ ur budget cell phone car 2 Your budget
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Evolutionary trade offs Common garter snake ough inned newt Rough skinned newt 3
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Evolutionary trade offs b l Problem: Newt is an easy potential prey ut But Produces strong neurotoxin Solution: Garter snake evolved toxin resistance 4
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Evolutionary trade offs Benefit for garter snake: dditional easy food source Additional easy food source Cost: Reduction in mobility leads to higher predation risk What is the trade off? Prediction: Toxin resistance should be only present 5 y p where newt is a potential prey
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Evolutionary trade offs (garter snake) 6
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lection and evolution Selection and evolution lection acts NLY trait has a genetic basis Selection acts ONLY if trait has a genetic basis Selection acts if there is variance present Selection does NOT CREATE new genes or alleles Selection DOES produce ADAPTATION
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hat is an adaptation? What is an adaptation? phenotypic trait that makes it more likely for A phenotypic trait that makes it more likely for an organism to reproduce and survive etter than alternatives) (better than alternatives) A process that produces the respective phenotypic trait
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Maladaptations? … are often a consequence of rapid environmental changes, e.g. induced by humans 9
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Maladaptations Brood parasitism in wood ducks and the effect of human interference 10 Example from Dugatkin 2004
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Maladaptations Brood parasitism in wood ducks and the effect of human interference 11
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Maladaptations Brood parasitism in wood ducks and the effect of human interference 12
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Maladaptations Brood parasitism in wood ducks and the effect of human interference 13
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Maladaptations Brood parasitism in wood ducks and the effect of human interference 14
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Maladaptations Brood parasitism in wood ducks and the effect of human interference 15
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Maladaptations Brood parasitism in wood ducks and the effect of human interference Conclusion?
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2011 Lect 17 Trade offs adaptations and mechanisms of evolution

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