according to a dna study from 2010, "a new portrayal of each ethnicity contribution to the dna of brazilians, obtained with samples from the five regions of the country, has indicated that, on average, european ancestors are responsible for nearly 80% of the genetic heritage of the population. the variation between the regions is small, with the possible exception of the south, where the european contribution reaches nearly 90%. the results, published by the scientific magazine "american journal of human biology" by a team of the catholic university of brasília, show that, in brazil, physical indicators such as skin colour, colour of the eyes and colour of the hair have little to do with the genetic ancestry of each person, which has been shown in previous studies (regardless of census classification). "ancestry informative snps can be useful to estimate individual and population biogeographical ancestry. brazilian population is characterized by a genetic background of three parental populations (european, african, and brazilian native amerindians) with a wide degree and diverse patterns of admixture. in this work we analyzed the information content of 28 ancestry-informative snps into multiplexed panels using three parental population sources (african, amerindian, and european) to infer the genetic admixture in an urban sample of the five brazilian geopolitical regions. the snps assigned apart the parental populations from each other and thus can be applied for ancestry estimation in a three hybrid admixed population. data was used to infer genetic ancestry in brazilians with an admixture model. pairwise estimates of f(st) among the five brazilian geopolitical regions suggested little genetic differentiation only between the south and the remaining regions. estimates of ancestry results are consistent with the heterogeneous genetic profile of brazilian population, with a major contribution of european ancestry (0.771) followed by african (0.143) and amerindian contributions (0.085). the described multiplexed snp panels can be useful tool for bioanthropological studies but it can be mainly valuable to control for spurious results in genetic association studies in admixed populations". it is important to note that "the samples came from free of charge paternity test takers, thus as the researchers made it explicit: "the paternity tests were free of charge, the population samples involved people of variable socioeconomic strata, although "likely to be leaning slightly