>Multi-racial environments are less cohesive, friendly, and trusting:

http://psychology.uwo.ca/faculty/rushtonpdfs/n&n%202005-1.pdf

http://www.boston.com/news/education/k_12/articles/2007/08/04/the_downside_of_diversity/

>Biological examination can find the typical racial self-identification with an accuracy of 99.8%

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1196372/?

>This is the same method used to verify dog breeds

http://news.vin.com/VINNews.aspx?articleId=23206

>Mixedrace children suffer from more health problems

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1448064/

>A massively well-funded study of over 100,000 schoolchildren found that “Adolescents who identify themselves as mixed race are at higher health and behavior risk than those of 1 race.” Indeed, even when controlling for education, socioeconomic status, and other factors, there is an across-the board higher rate of health risks amongst mixed race adolescents than mono-racial adolescents.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1448064/

>One study found that White-Asian mixes had a 2x higher rate of being “diagnosed with a psychological disorder, such as anxiety, depression or substance abuse.”

http://www.eurekalert.org/pub_releases/2008-08/uoc--baa081108.php

>A study on Black-White mixes in agreement found that ”When it comes to engaging in risky/anti-social adolescent behavior, however, mixed race adolescents are stark outliers compared to both blacks and whites.” This holds true despite being raised in similar environments to mono-racial children.

http://www.msu.edu/~renn/RHE-_mixed_race.pdf

>Often race-deniers and cultural Marxists will bring up Haldane’s rule, arguing that since races can mix and create fertile offspring, the genetic distance is not too great. Haldane’s rule is “when in the offspring of two different animal races one sex is absent, rare, or sterile, that sex is the heterogametic [XY] sex.”

http://www.nature.com/scitable/topicpage/haldane-s-rule-the-heterogametic-sex-1144

>Indeed, although Black-White mixes are not sterile and males are not absent, males (the heterogametic sex) are more rare than females.

http://www.jstor.org/pss/1537084

>The argument regarding Haldane’s rule is also meaningless because different species in the animal kingdom can breed and still produce fertile offspring. The wolf (Canis lupus) and the dog (Canis lupus familiaris), the coyote (Canis latrans), and the common jackal (Canis aureus) are separate species yet can all interbreed and produce fertile offspring.

http://www.jstor.org/discover/10.2307/3671304?uid=3739600&uid=2&uid=4&uid=3739256&sid=47699085472247

>Two species of orangutan (Pongo abellii from Sumatra and Pongo pygmaeus from Borneo) can interbreed despite having different chromosomal numbers.

http://www.nytimes.com/1995/02/28/science/orangutan-hybrid-bred-to-save-species-now-seen-as-pollutant.html?pagewanted=all&src=pm

>The common chimpanzee (Pan troglodytes) and the bonobo (Pan paniscus) and many species of birds, such as the pintail (Anas acuta) and the mallard (Anas platyrhynchos), can interbreed as well.

http://www.sciencedaily.com/releases/2007/04/070420104723.htm

http://birdaz.com/blog/2011/02/24/mallards-the-weird-and-the-wonderful/

>The gibbon and the siamang can also interbreed to produce a hybrid

http://www.ncbi.nlm.nih.gov/pubmed/451603

http://www.ncbi.nlm.nih.gov/pubmed/1060807

>Some species that aren’t even in the same genus can interbreed.

http://aob.oxfordjournals.org/content/74/2/111.full.pdf

>The average rate of success for mixed race couples is around half that of same race couples, 0.127 compared to 0.213.

http://www.jstor.org/stable/4145377

>There is evidence that the more similar the two people are, the happier their marriage tends to be.

https://www.sciencedirect.com/science/article/pii/019188699190057I

>A study in Iceland showed that 3rd cousin marriages are the most fertile and successful. Suggesting that mating within one's ethnic/racial group would be more beneficial than outside of one's ethnic/racial group.

http://www.sciencemag.org/content/319/5864/813.abstract



>One study showed that people tend to find their own face when morphed into the opposite sex most attractive, even when he/she doesn't know it's his own face, strongly suggesting that people typically prefer those who look like themselves, in other words their own racial/ethnic group.

http://www.psyc.nott.ac.uk/research/vision/jwp/papers/pentonvoak1999.pdf

>Hybrid vigor (heterosis) does not seem to apply to humans as we are already very heterozygous, at 0.776 [http://mbe.oxfordjournals.org/content/14/7/707.full.pdf] Compared to dogs for example at 0.401. [http://www.eebweb.arizona.edu/Courses/Ecol406R_506R/Garcia-Moreno1996-Wolf.pdf]

>Although some argue that race mixing "averages out" traits and since average faces are considered more attractive [http://cs.brown.edu/courses/cs143/2009/lecture13.pdf] then mixed race offspring are more attractive.

>However this is fallacious as it assumes we are designed for perfect symmetry, when in fact the magnitude of asymmetry is the correct measurement and this random component fulctuates, also called "fluctuating asymmetry" - so more honestly a lower level of asymmetry correlates with increased attractiveness, not symmetry.

http://beheco.oxfordjournals.org/content/15/5/864.abstract

>But does increased heterozygosity cause lower asymmetry? A meta analysis of 118 datasets in 14 studies showed a very weak inverse correlation between the two, showing that increased heterozygosity has no beneficial effect on symmetry or asymmetry

http://www.nature.com/hdy/journal/v83/n2/full/6885550a.html

>One study on the craniofacial morphology in White-Amerindian mixed race individuals found that over half of the 52 shape variables deviated from the mathematical average completely shattering the above argument.

http://majorityrights.com/images/uploads/spanish.indian.pdf

>The neurotransmitter oxytocin "makes people more co-operative, benevolent, loyal, generous and trusting of others. It is involved in the parent-child bond - new mothers and fathers have raised levels of oxytocin. Production also increases when people hug and when they have sex and, recent research suggests, when they receive psychological warmth." However, oxytocin has been alleged to "foster racism."

http://www.guardian.co.uk/technology/2011/jan/30/bright-ideas-oxytocin-hormone-racism

>The study found that "intergroup bias that fuels prejudice, xenophobia, and intergroup violence… Which maybe modulated by brain oxytocin." This suggests that the instinctual desire to pursue the interests of one's own ethnic group to further ensure the existence of one's people is linked to racial bias, coinciding with the observation that diversity is a weakness, not a strength.

http://www.pnas.org/content/early/2011/01/06/1015316108

>Although egalitarians suggest that only a racist would consider race when it comes to reproduction and mate choice, this study observed a general, innate tendency to prefer one's own race especially when most likely to be impregnated.

http://www.cdnresearch.net/pubs/private/racebias.pdf

>One obstacle to finding a matching donor was her mixed ethnic background. Her father is black, with West Indian and Panamanian roots. Her mother is white, with Russian-Jewish roots. In addition, only 5 percent of registered donors are black.

http://www.nytimes.com/1996/04/18/sports/baseball-rod-carew-s-daughter-dies.html

>''Compared to organ transplants, bone marrow donations need to be even more genetically similar to their recipients. Since all the immune system's cells come from bone marrow, a transplant essentially introduces a new immune system to a person. Without genetic similarity between the donor and the patient, the new white blood cells will attack the host body.

http://www.time.com/time/health/article/0,8599,1993074,00.html

>If you become ill with a blood cancer or other disease that requires a stem cell transplant, here's an uncomfortable fact: Your race matters. Diversity is a strength in much of life, [citation needed!] but it's a curse when finding a stem cell donor match.

http://articles.washingtonpost.com/2013-08-05/national/41085742_1_stem-jeffrey-chell-ancestors

>Nonindigenous species can bring about a form of extinction of native flora and fauna by hybridization and introgression either through purposeful introduction by humans or through habitat modification, bringing previously isolated species into contact. These phenomena can be especially problematic for rare species coming into contact with more abundant ones. Increased use of molecular techniques focuses attention on the extent of this underappreciated problem that is not always apparent from morphological observations alone. Some degree of gene flow is a normal, evolutionarily constructive process, and all constellations of genes and genotypes cannot be preserved. However, hybridization with or without introgression may, nevertheless, threaten a rare species' existence.

http://www.annualreviews.org/doi/abs/10.1146/annurev.ecolsys.27.1.83

>We investigated various cases of the island model with stochastic migration. If the population is infinite, the immigrants have a fixed gene frequency and the alleles are neutral, the gene frequency on the island converges to that of the immigrants.

What this means is that the genes initially on the model island, in effect, disappeared.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1213928/pdf/163.pdf

>Migration between local populations plays an important role in evolution - influencing local adaptation, speciation, extinction, and the maintenance of genetic variation.

>A number of studies have shown that when per capita population growth rate is treated as a random variable, rather than a fixed parameter, then directional evolution is influenced not only by the expected fitness of each phenotype, but also by the variance and other moments [23], [28]-[33]. This follows from the fact that, in a closed population, change in mean phenotype is inversely proportional to mean population fitness

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0007130

Figure 1. The consequences of a negative correlation between fitness and immigration rate:

http://www.plosone.org/article/fetchObject.action?uri=info:doi/10.1371/journal.pone.0007130.g001&representation=PNG_M

Figure 2. The influence of the variance in immigration rates, on the expected change in mean phenotype:

http://www.plosone.org/article/fetchObject.action?uri=info:doi/10.1371/journal.pone.0007130.g002&representation=PNG_M

Essentially, when the variance in the immigration rate is small it results in a negative phenotypic change on the mean phenotype of a population, as the migrant phenotypes predominate.

Figure 3. The relation between variance in immigration, selection, and in an island-continent model:

http://www.plosone.org/article/fetchObject.action?uri=info:doi/10.1371/journal.pone.0007130.g003&representation=PNG_M

>bottom-right in picture.

>The curves show the change in mean phenotypic value assuming a mean phenotypic value as decided by a population's selection.

>The variance in migration is shown in descending value on the curves.

Though the mean rate of migration is the same on all the curves, it is clear that the the island can still get close to fixation of the phenotype favoured there, so long as the variance in immigration is high.

So for this figure, assuming that migration is an indefinitely persisting condition, migrants will prevent the local island favored phenotype from remaining intact, as they are essentially working against selection.