Look, I've repeatedly provided you with sources, and evidence. But because I am just so fucking nice, I'm going to post some more for you. I'll even provide you with summaries.
Position Paper of the NATIONAL HUMAN GENOME CENTER (doc):
Findings1. The biological variation of the human species exhibits gradients of differentiation, not subdivisions into homogeneous, discontinuous units.
2. The within-versus the between-group variation is greater in the so-called “races” of traditional anthropology (e.g., Mongoloid, Australoid, Caucasoid, Negroid). Therefore the majority of variation within the human species is found between individuals and not groups.3. The ancestry of maternal (mtDNA) and paternal (Y chromosome DNA) lineages crosscut the group (“racial”) boundaries suggested by anatomical traits like skin color and hair form.
5. The demographic units of human societies (and of the U.S. census) are the products of social, cultural, or political rules, not the forces of biological evolution.*************************************************************************************
An
open letter published in Genome Biology 2008:
Statement 2: We recognize that individuals of two different geographically defined human populations are more likely to differ at any given site in the genome than are two individuals of the same geographically defined population. Research in human genetics has highlighted that there is more genetic variation within than between human groups, where those groups are defined in terms of linguistic, geographic, and cultural boundaries [3,5,13,14]. Patterns of variation, however, are far from random. We recognize that human population history, including major migrations from one continent to another as well as more short-range movements, has led to correlation between genetic variation and geographic distribution [14-17]. This finding is particularly true of indigenous peoples; populations characterized by a high degree of interaction with neighboring groups adhere less to these patterns.
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American Association of Physical Anthropologists Statement on Biological Aspects of Race:
2. Biological differences between human beings reflect both hereditary factors and the influence of natural and social environments. In most cases, these differences are due to the interaction of both. The degree to which environment or heredity affects any particular trait varies greatly.
3.
There is great genetic diversity within all human populations. Pure races, in the sense of genetically homogenous populations, do not exist in the human species today, nor is there any evidence that they have ever existed in the past.4. There are obvious physical differences between populations living in different geographic areas of the world. Some of these differences are strongly inherited and others, such as body size and shape, are strongly influenced by nutrition, way of life, and other aspects of the environment. Genetic differences between populations commonly consist of differences in the frequencies of all inherited traits, including those that are environmentally malleable.
5. For centuries, scholars have sought to comprehend patterns in nature by classifying living things. The only living species in the human family, Homo sapiens, has become a highly diversified global array of populations. The geographic pattern of genetic variation within this array is complex, and presents no major discontinuity. Humanity cannot be classified into discrete geographic categories with absolute boundaries. Furthermore, the complexities of human history make it difficult to determine the position of certain groups in classifications. Multiplying subcategories cannot correct the inadequacies of these classifications.
Generally, the traits used to characterize a population are either independently inherited or show only varying degrees of association with one another within each population. Therefore, the combination of these traits in an individual very commonly deviates from the average combination in the population. This fact renders untenable the idea of discrete races made up chiefly of typical representatives.***********************************************************************************
Now for some peer-reviewed journals!
"An apportionment of human DNA diversity," Proceedings of the National Academy of Sciences, April 29, 1997 vol. 94 no. 9 4516-4519:
It is often taken for granted that the human species is divided in rather homogeneous groups or races, among which biological differences are large. Studies of allele frequencies do not support this view, but they have not been sufficient to rule it out either. We analyzed human molecular diversity at 109 DNA markers, namely 30 microsatellite loci and 79 polymorphic restriction sites (restriction fragment length polymorphism loci) in 16 populations of the world. By partitioning genetic variances at three hierarchical levels of population subdivision,
we found that differences between members of the same population account for 84.4% of the total, which is in excellent agreement with estimates based on allele frequencies of classic, protein polymorphisms.
Genetic variation remains high even within small population groups. On the average, microsatellite and restriction fragment length polymorphism loci yield identical estimates.
Differences among continents represent roughly 1/10 of human molecular diversity, which does not suggest that the racial subdivision of our species reflects any major discontinuity in our genome.********************************************************************************
"Apportionment of global human genetic diversity based on craniometrics and skin color," American Journal of Physical Anthropology, Volume 118 Issue 4, Pages 393 - 398, Published Online: 11 Jul 2002:
number of analyses of classical genetic markers and DNA polymorphisms have shown that the majority of human genetic diversity exists within local populations (85%), with much less among local populations (5%) or between major geographic regions or races (10%). Previous analysis of craniometric variation (Relethford [1994] Am J Phys Anthropol 95:53-62) found that between 11-14% of global diversity exists among geographic regions, with the remaining diversity existing within regions. The methods used in this earlier paper are extended to a hierarchical partitioning of genetic diversity in quantitative traits, allowing for assessment of diversity among regions, among local populations within regions, and within local populations. These methods are applied to global data on craniometric variation (57 traits) and skin color. Multivariate analysis of craniometric variation shows results similar to those obtained from genetic markers and DNA polymorphisms: roughly 13% of the total diversity is among regions, 6% among local populations within regions, and 81% within local populations. This distribution is concordant with neutral genetic markers. Skin color shows the opposite pattern, with 88% of total variation among regions, 3% among local populations within regions, and 9% within local populations, a pattern shaped by natural selection.
The apportionment of genetic diversity in skin color is atypical, and cannot be used for purposes of classification. If racial groups are based on skin color, it appears unlikely that other genetic and quantitative traits will show the same patterns of variation.************************************************************************************
Would you like more information on how racial categories fail in basically ever single way? Because I can literally give you hundreds of studies and articles on the issue.