Shaw Lecture 2(web) - 1 How do behaviors evolve 1 Loss of character 2 Change in motivation 3 Change in frequency or duration 4 Change in context 5

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Unformatted text preview: 1 How do behaviors evolve? 1. Loss of character 2. Change in motivation 3. Change in frequency or duration 4. Change in context 5. Change in form (Monday) 6. Evolution of novel character (Monday) Evidence for behavioral evolution Change through time 1. Fossil evidence (rare) 2. Historical observation--can observe evolution in action Phylogenetic distributions 1. Vestigial traits 2. Comparisons of close relatives using phylogenies Parasitism rates (Zuk et al. 2006): Normal wing males: >30% Flatwing males: ~ 1% “normal” male wing “fatwing” male wing Female wing Tinghitella, 2008 Heredity g Genetic basis to fatwing mutation Cross Autosomal dominant Autosomal recessive Sex-linked F1 0:1 1:0 1:0 F2 1:3 3:1 1:1 Backcross (BC1)a 1:1 1:0 1:0 Backcross (BC2)b 0:1 1:1 1:1 Cross F1 670:1 F2 171:160 BC1 170:0 BC2 75:84 Tinghitella, 2008 Heredity Expected number of males (normal-wing:flatwing) Observed number of males (normal-wing:flatwing)----> consistent with X-linkage Evidence for behavioral evolution Change through time 1. Fossil evidence (rare) 2. Historical observation--can observe evolution in action Phylogenetic distributions 1. Vestigial traits 2. Comparisons of close relatives using phylogenies Vestigial traits : Rudimentary traits that are homologous to Fully Functional traits in closely related species Vestigial trait in humans ¡unctional trait in mammals with Fur www.bbc.co.uk/nature/wildfacts/ 2...
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This note was uploaded on 04/07/2009 for the course BIO 2210 taught by Professor Seeley during the Fall '08 term at Cornell University (Engineering School).

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Shaw Lecture 2(web) - 1 How do behaviors evolve 1 Loss of character 2 Change in motivation 3 Change in frequency or duration 4 Change in context 5

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