EVOLUTION OF BEHAVIOR - interval, pulse repetition rate,...

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EVOLUTION OF BEHAVIOR One general view in the study of the evolution of behavior is that behaviors can have a genetic basis . This is not to say that all behaviors are genetically based; indeed many behaviors are entirely culturally transmitted or learned and may have little to do with genetics (why are you sitting in the same seat?). For genetically influenced behaviors we can treat them as we would treat any other genetically controlled trait of an organism: 1) if there are genetically based differences in a behavior, and 2) these differences affect fitness then, 3) behaviors can evolve by natural selection. Two examples of genetically based behaviors: cricket song. Different species of crickets have different calling songs with different characteristics, e.g., inter chirp
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Unformatted text preview: interval, pulse repetition rate, etc. Hybrids between closely related species often exhibit songs with intermediate characteristics (pulse repetition will be intermediate, inter pulse interval will be intermediate, etc.) a hypothetical example with time on horizontal axis and each chirp = a group of vertical lines: Another example (on a larger phylogenetic scale) is head scratching with the hind leg in amniotes (reptiles, birds, mammals; those with an amniotic sac). Most reach the hind leg over the fore limb to scratch the head; that birds and mammals do it suggests that this behavior has a genetically programmed basis and has been inherited through much of higher vertebrate evolution....
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This note was uploaded on 11/05/2011 for the course BIOLOGY MCB2010 taught by Professor Jessicadigirolamo during the Fall '10 term at Broward College.

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