Being prejudiced based on biology. If you don't want to let people with IQ less than a certain threshold into the country; then you should give applicants IQ tests, not look at their pigmentation levels (and if you are really worried about IQ levels, then you should also test ethnic Swedes and expel those with low scores).
But then you would have to prove it. Given that our knowledge of human biology is at a premature stage, this likely not possible for the moment. All kinds of factors can influence how people end up - whether things like aggressiveness or intelligence. Nutrition could influence, education could influence; and effects could accumulate over generations. Until we can provide decent estimates on how people are going to behave solely from DNA, the case for linking behaviour with biological ethnicity will be weak, because the possible contributing factors will be hard to separate.With that said however, I wouldn't ever get a Chihuahua, because they are less intelligent, they take WAY more training before they stop pooping indoors, and they bark at the mailman even though he is just doing his job.
If two populations largely live segregated, then the non-biological factors can vary a lot between the two populations. If they do not live segregated, then they would likely interbreed and soon there would no longer exist two separate populations to study. So that's why you want to understand the DNA if you want to get to the bottom of it.
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