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Culture. Everything one group can do the other can as well. Everyone originated from Africa based on bone studies before the migration and everyone split up. We're all cousins. 

There is also no such thing as race, its a social construct to separate one human group from another. We're all phenotypes.

phe·no·type

   (fē′nə-tīp′)

n.
1.
a. The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup andenvironmental influences.
b. The expression of a specific trait, such as stature or blood type, based on genetic and environmental influences.
2. An individual or group of organisms exhibiting a particular phenotype.
Genotypes are just individuals or organisms who come from a similar genepool and express similar outer features. Phenotypes are once genotypes whose outer appearance changed because of exposure to another environment.

Hence...once everyone left Africa they changed.