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Of course races exist, just like species as gred used as an example.
Yes, a black hair, brown eyed caucasian would look similar to someone of oriental descent, much in the same way the facial construct of a Boxer dog is similar to that of a Bulldog.
Races would be characterised by their uniqueties (even a word?), not similarities.
Just like you get labradors both in black or golden, you get blonde and brunette people.
Mixing of racial genetics causes hybrids, so a blonde white person has a baby with an arab say, and the blonde gene does not recess, you get someone of mixed racial descent, so possibly an arab with blonde hair.
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My Mixes
  
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