1 / 7

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.

manjit
Télécharger la présentation

LONG-TERM EVOLUTIONARY EXPERIMENTS CHAPTER 6

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related