May 28, 2012

Natural Selection

My model depicts a prime example of natural selection.  The example deals with English peppered moths which come in two different colors: a light shade and a dark shade.  In England prior to being industrialized, the moths with the light shade were better adapted to the environment because they were more adept at camouflaging in order to hide from predators.  This made for a larger population of the light shaded peppered moths.  Once England became industrialized and numerous factories were built there was a lot of pollution in the air.  The factories mainly ran on coal which produced a thick black smoke.  The smoke inevitably reached and settled on the plant life making the trees considerably darker.  The dark trees made the light shaded moths visible, and more prone to predation; allowing for the dark shaded moths to survive and reproduce.  Ultimately there was a greater population of dark shaded moths than light shaded moths.  Natural selection allows more the more fit member of a species at the given time reproduce at a higher rate, due to less predation or the ability to easily obtain resources, which increases the frequency of the given trait that makes that member more fit.

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