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LONG-TERM EVOLUTIONARY EXPERIMENTS CHAPTER 6

LONG-TERM EVOLUTIONARY EXPERIMENTS CHAPTER 6. http://natsci.edgewood.edu/wingra/Student%20Projects%202008/E.%20Coli/default.htm. ADAPTIVE RADIATION STUDIES PROVIDE LIMITED INFORMATION AS TO WHY IT HAPPENED AND WHAT OTHER POSSIBILITIES MAY HAVE BEEN POSSIBLE.

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LONG-TERM EVOLUTIONARY EXPERIMENTS CHAPTER 6

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  1. LONG-TERM EVOLUTIONARY EXPERIMENTSCHAPTER 6 http://natsci.edgewood.edu/wingra/Student%20Projects%202008/E.%20Coli/default.htm

  2. ADAPTIVE RADIATION STUDIES PROVIDE LIMITED INFORMATION AS TO WHY IT HAPPENED AND WHAT OTHER POSSIBILITIES MAY HAVE BEEN POSSIBLE. http://news.nationalgeographic.com/news/bigphotos/83795719.html CLASSICAL STUDIES: GALAPAGOS FINCHES, AFRICAN CICHLIDS, STICKLEBACKS

  3. SHORT-TERM SELECTION VERSUS LONG-TERM STUDIES SHORT-TERM limited number of generations Can lead to erroneous inferences regarding genetic correlations LONG-TERM Association of organism and environment is open-ended Direct investigation of why an adaptation happened (causality) Model organisms - insects (Drosophila) or microbes (E. coli) Long-term studies are able to study the importance of chance impacts on adaptation THE THEORY OF EVOLUTION BY NATURAL SELECTION PROVIDES A CAUSE-AND-EFFECT FRAMEWORK (EVEN MATHEMATICALLY) BUT NOT THE MECHANISMS. www.nature.com http-//louisproyect.wordpress.com

  4. CLONAL INTERFERENCE MAINTAINS DIVERSITY Periodic selection : natural selection recurrently purges diversity within a bacterial population Recombination in bacteria is rare Diversity is generally transient Larger populations (possible via long-term studies) >> multiple beneficial mutations>> diversity persists 3 ways ( Dr. Bennett) http-//www.nature.com/nrg/journal/v4/n6/box/nrg1088_BX2

  5. ADAPTIVE RADIATION:Trade-off between resource breadth and competitive ability • Organism may be good at using one resource and not another>>>leads to co-existence of species http://natsci.edgewood.edu/wingra/Student%20Projects%202008/E.%20Coli/default.htm

  6. SUMMARY Long-term studies • direct observation of adaptation • mechanisms of adaptation • evaluation of environmental and genetic factors • causality of evolutionary change

  7. References • http://abcnews.go.com/Technology/DyeHard/climate-change-find-tiny-stickleback-fish-evolved-temperatures/story?id=11368797 • http://www.plosbiology.org/ • http://www.biomedcentral.com/1471-2148/10/11 • http://beaker.biology.washington.edu/research/pubs/2002/Bohannan_et_al2002.pdf • http://www.hhmi.org/genesweshare/e120.html • http://www.nature.com • http://www.nanobugs.com/ • http://www.ncbi.nlm.nih.gov • http://news.nationalgeographic.com/news/bigphotos/83795719.html http://www.plosbiology.org/article/info:doi%2F10.1371%2Fjournal.pbio.1000250

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