[QUOTE="Mr.Grieves
Genetic variety vs. gene-pool stagnation. The more 'pure-blooded' a population becomes, the more they compound the genetic disorders they have in common. The more similar the genes of the parents, the more likely the parents are to both have the same 'bad genes', and the more likely they are to pass those genes onto their offspring. Disorders like Tay-Sachs, cystic fibrosis, sickle cell anemia, lactose intolerance, and thalassemia are all examples. A strict rule of 'No Outsiders' in any population, be it a family, a few families, a town or even a nation will eventually result in such genetic disorders, which will grow more and more common with each new generation that rejects any new blood. When both parents come from very different gene-pools, they each are almost guaranteed to lack the other's 'bad genes', and thus the chance of these 'bad genes' being passed down to their offspring are slim to none.
I'm by no means suggesting it's somehow bad to have kids within your own race. I'm just pointing out the folly of thinking 'racial purity' in a community is advantageous as a rule, given it's objectively the opposite where health is concerned, and eventually downright self-destructive.[/QUOTE]
i thought along that line of reasoning in the past. its not so cut and dry as simply saying, "dilute the harmful recessive (or dominant) alleles til theyre virtually extinct!" also consider that the breeding populations of specific races are large enough to make such race-linked disorders far less of a problem.
finally, the last human genetic bottleneck we went through has kept us far, far more similar than we would expect. we arent dealing with huge differences in DNA (superficial stuff, really), but we are dealing with huge differences in tradition and culture
Mixed-race individuals
The "National Household Survey on Drug Abuse" in 1999 stated that of the major racial/ethnic groups, drug use was highest among those reporting to be mixed race.
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A 2002 study stated that "
Mean levels of three characteristics—verbal IQ, number of sexual partners, and birth weight—were examined in African American, White (European-descent) Americans, and Black/White mixed race American adolescents. The sample came from Wave 1 of the National Longitudinal Study of Adolescent Health. The mean age was 16 years. According to their interviewers, the mixed race children had an African American physical appearance. The African American adolescents had a lower birth weight, a lower verbal IQ, and a higher number of sexual partners than did White adolescents. For each characteristic, the mixed race mean fell between the means of the two parental populations."
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A 2003 study stated that most earlier studies on mixed-race adolescents had found increased risk for emotional, health, and behavior problems. The most common suggested explanation was identity problems, leading to lack of self-esteem, social isolation, and family problems in mixed-race households. The study stated that it was the first using a large, nationally representative sample. Compared with non-mixed adolescents, the mixed race adolescents often had increased risk for various health problems, substance abuse problems, and behavior problems. While there were differences between different mixed race groups, there was a generally increased risk for all race combinations for most risks.
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A 2006 study found increased risks for multiracial adolescents for various problems, including violent behaviors.
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Another 2006 study which examined behavioral health found that multiracial Hispanics/Latino adolescents and multiracial non-Hispanic adolescents had more behavioral health problems than monoracial Hispanic adolescents.
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A 2008 study stated that "
Over the past 40 years the fraction of mixed race black-white births has increased nearly nine-fold. [...] As one might expect, on a host of background and achievement characteristics, mixed race adolescents fall in between whites and blacks. When it comes to engaging in risky/anti-social adolescent behavior, however, mixed race adolescents are stark outliers compared to both blacks and whites. [...] Mixed race adolescents -- not having a natural peer group -- need to engage in more risky behaviors to be accepted."
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A 2008 study of Chinese-Caucasian, Filipino-Caucasian, Japanese-Caucasian and Vietnamese-Caucasian individuals found that biracial Asian Americans were twice as likely as monoracial Asian Americans to be diagnosed with a psychological disorder.
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source:
https://en.metapedia.org/wiki/Effects_of_race_mixing