110509 evolution - 110509 evolution -Florida scrub jays...

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110509 evolution -Florida scrub jays -direct reciprocity -sometimes juveniles help their own siblings- increases representation of shared allele for cooperation in the population -- coevolution: will not get to evolution of sex -evolution of one species as a result of another which also affects the evolution of the first -not the same as specialization, which is when one species evolves as the result of another, but not reciprocated -detecting coevolution by examining traits in a geographic mosaic -shown in graph: trait (y axis) vs geography (x) -ex: crossbills and pines -types of coevolution: antagonistic, mutualistic, etc. Antagonism: disease evolution -matching allele system. -host has protein, either R or r -parasite has another protein that mimics the host’s- V or v, mimics R or r, respectively -if the pathogen has an allele that has the protein that mimics host, then it is successful -the host genotype will try to evolve so that its protein is different from the parasitic genotype’s—coevolutionary cycle -Matching allele: -V mimics R; R doesn’t recognize V as a pathogen, but does recognize v. -1. Parasite evolves to look like host: host-RR, so pathogen evolves to be VV -2. selective pressure on host, now host evolves to look different and that has different surface protein- parasite:VV, host:rr -3. Parasite evolves to look like host- host:rr, parasite:vv -4. Host will evolve to look different- pathogen: rr, host:RR, then go back to 1 -Antagonism: disease/parasite (uses V and R but means different things)
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110509 evolution - 110509 evolution -Florida scrub jays...

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