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.
What is a polymorphism? Explain.
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