Here's the new thread for posting quotes, with the usual rules:
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Given how I might have said/believed something similar myself just a couple years back, I think I know what is meant. You get a photo of Colin Powell and he was about light-skinned as Bush -- so since different people of the same skin-hue are one called 'white' and the other 'black', one thinks it might the division may be entirely a cultural artifact.
Also there's no single characteristic which doesn't fluctuate gradually across populations -- so any grouping seems again entirely arbitrary.
But a visual that got me to understand the above view was too-simplistic was this graph here at Lewontin's argument and criticism. Though any one characteristic wouldn't suffice to divide humanity meaningfully into races, several characterics taken together in can form clusters...
So such groupings are in fact meaningful.
If you used to believe this yourself, then maybe you can explain to me what you mean(t) by 'entirely a cultural artifact.' Did you think that the people in question didn't have different skin tones? That skin tone isn't a genetic trait? That there was no correlation between a racial grouping and any phenotypic or genetic marker, like skin color? That genetic relatedness is confabulated in a grand game of make-believe?
"there's no single characteristic which doesn't fluctuate gradually across populations" - No, some traits have reached fixation in ... (read more)