Tuesday, October 22, 2013

Does Race Exist? (Prompt 1) (Sorry Mr. Quick, the margins are really off)

Does Race Exist?
The Does Race Exist? article highlights that people emphasize on aesthetics to define race while scientists emphasize on genetic structure.  Race is widely categorized by physical features and characteristics. Scientists categorize race by using genetics. For instance, two people of the same race may have completely contradicting genetic makeup, but two people of the completely opposite race may share more genetic similarity than two individuals of the same race. The outward signs of which race are based on are only dictated by a handful of genes. Scientists can use genetics to sort populations and trace their ancestral geographic origin.

Scientists can sequence human genome to identify polymorphisms across population that reflects the history of those populations and the effects of natural selection. The ideal genetic polymorphism would be present in all members of one group and absent in all members of another group. Nowadays, major racial groups have mixed together too much for these polymorphism differences to exist. However, since polymorphisms occur at different frequencies around the world, people can be roughly sorted into groups. If two people have the same of a certain polymorphism sequence, they are descendants from a common ancestor. By comparing polymorphism sequences, scientists can see how closely related or how far apart a group (particularly a race) is related to each other. 

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