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Download Speciation and Patterns of Evolution - slater science
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Speciation evolution of a new species occurs when members of similar populations no longer interbreed to produce offspring in a natural environment In order for their to be speciation, there must be isolation Geographic isolation when a physical barrier divides a population volcano earthquake (produce islands) flood Gene pools will evolve separately can become different enough to be separate species Speciation Reproductive isolation Populations can no longer produce fertile offspring genetic material can be so different that reproduction is not possible Behaviors can also prevent reproduction mating at different times of the year Patterns of Evolution 1) Convergent evolution distant related organisms evolve similar traits develop structures for the same function analogous structures Convergent evolution 2)Divergent evolution pattern where species that were similar to an ancestral species become more distinct become less alike as they adapt to separate environments homologous Divergent Evolution • adaptive radiation - a species adapts into a variety of species to fit many diverse habitats Finches’ beaks adapted to food sources on Galapagos Islands Adaptive Radiation Adaptive Radiation ADAPTIVE RADIATION –An example of divergent evolution http://www.vanderbilt.edu/AnS/english/Clayton/Galapago_finches.gif http://evolution.berkeley.edu/evolibrary/home.php Artificial Selection Breeding organisms for desired traits • Agriculture (plants and livestock) • Dogs and other pets Artificial Selection What about Super Cow?
