patterns of Evolution - Humans have genetic variations in...

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Divergent evolution is when two related species become dissimilar. An example of this is when a red fox lives in a farmland that is mixed with forests. The red color helps blend in with the trees. A kit fox that lives in the desert in sand is concealed from prey and predators by the sandy color it has. The kit fox has adapted to its environment by growing larger ears which help the kit fox to rid itself of excess body heat. Convergent evolution is when two species that are not related become more similar in appearance. An example of this would be the cactus plant. Two cactus plants growing, one in American desert and another in African desert, both have fleshy stems with spines to ward off predators and have adapted to their environment in order to store water. Genetics of a species is what natural selection is all about.
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Unformatted text preview: Humans have genetic variations in their gene pool but some habitats fit certain human skin better than others. There are some albino skinned humans who are very sensitive to the sun and are more likely to develop skin cancer. Human origins are hard to understand. However human evolution is shaped by natural selection. Skin color seems to be a good example because it shows that when people are in an environment where the sun is hot and shines for longer periods of time the people there tend to develop more brown skin color. However in other areas of the world where the climate is cold and people have to be indoors to keep warm most of the months of the year then their skin color tends to be very white....
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This note was uploaded on 09/30/2010 for the course BIO 100 BIO/100 taught by Professor Ray during the Fall '09 term at University of Phoenix.

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