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If I were of Mexican descent, and needed a kidney, I would certainly appreciate it if the appropriate agency concentrated their search among other Mexicans, as opposed to including fair-skinned redheads in their efforts.
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"Mexican" is not a race. It would be even better if they found someone within your own family, but your own family is also not a separate race.
Genetic relatedness certainly does create genetic clustering, but if you defined race by genetic relatedness, you either (1) end up with every family being a separate race; or (2) your divisions again are completely arbitrary.