timeisdead wrote:
Without classification, you have lost the objective of language. Without descriptive differentiating terms, there would be no meaningful communication.
Certainly, but does this not indicate the likely result of confused and non-coherent classifications (specifically does it not predict that confused and non-coherent classifications will confuse meaningful communication and render it less coherent)?
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Why can a person's race or even subrace be determined by genetic testing?
It cannot be.
People who share common descent, are very likely to share genetic material. Inheriting genetic material from one's ancestors is very real, trying to correlate the results onto an outdated socially constructed schemata, is simply a refinement of a social construct.
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Why is it that the probability of having certain diseases is often correlated with race or ethnicity?
Because there is some overlap between race and "descent from common ancestors".
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Why is it that your body will be less likely to reject a bone marrow transplant from one of the same race?
You are less likely to reject transplants, the more closely they resemble your own tissue, ergo the more genetically similar you are. Genetic similarity increases with decreased generational distance between last commonly shared ancestor, and there is some overlap between what is referred to as race and the very real condition of shared ancestry.
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Even in different species of animals there are variations one can't ignore.
We can ignore and find significant to our heart's content. That is why to most people, most Japanese people are racially of a kind, but to the Japanese there is a much larger group of "races" present in the population others consider to be one "race" (Japanese).
The same is true of many other things. You might think blue and green and very different in ways that cannot be ignored, but there are whole cultures that do ignore such difference, "seeing" light and dark as the only meaningful colour classification.