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Cepaea are very good model organisms for the study of evolution in the wild because they 'carry their genes upon their backs'. More exactly, you can record the genetic composition of a population by looking at shell characteristics. These characteristics are adaptive and variable in Cepaea, so it is possible to look for the effects of natural selection. Because of these advantages, there is a large dataset of historical information on Cepaea populations that we are now able to use as a baseline for the Evolution MegaLab investigation.
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