Mixed-race Brazilian - White/Black

White/Black

According to some Historians, Portuguese settlers in Brazil used to prefer to marry Portuguese-born females. If not possible, the second option were Brazilian-born females of recent Portuguese background. The third option were Brazilian-born women of distant Portuguese ancestry. However, the number of White females in Brazil was very low during the Colonial period, causing a large number of interracial relationships in the country.

White/Black relationships in Brazil started as early as the first Africans were brought as slaves in 1550 where many portuguese men starting marrying black women. The Mulattoes (people of White/Black ancestry) were also enslaved, though some children of rich aristocrats and owners of gold mines were educated and became important people in Colonial Brazil. Probably, the most famous case was Chica da Silva, a mixed-race Brazilian slave who married a rich gold mine owner and became one of the richest people in Brazil.

Other mulattoes largely contributed to Brazil's culture: Aleijadinho (sculptor and architect), Machado de Assis (writer), Lima Barreto (writer), Chiquinha Gonzaga (composer), etc.

In 1835, Blacks would have made up the majority of Brazil's population, according to a more recent estimate quoted by Thomas Skidmore. In 1872, their number was shown to be much smaller according to the census of that time, outnumbered by pardos and Whites.

According to a genetic study with about 200 limited samples, 86% of Brazilians would have, at least, 10% of Black African genes.

The researchers however were cautious about its conclusions: "Obviously these estimates were made by extrapolation of experimental results with relatively small samples and, therefore, their confidence limits are very ample". A new autosomal study from 2011, also led by Sérgio Pena, but with nearly 1000 samples this time, from all over the country, shows that in most Brazilian regions most Brazilians "whites" are less than 10% African in ancestry, and it also shows that the "pardos" are predominantly European in ancestry, the European ancestry being therefore the main component in the Brazilian population, in spite of a very high degree of African ancestry and significant Native American contribution. Other autosomal studies (see some of them below) show a European predominance in the Brazilian population. Some researchers have found that the average European American type has approximately 10% to 12% non-White genetic material.

According to an autosomal DNA genetic study from 2011, both "whites" and "pardos" from Fortaleza have a predominantly degree of European ancestry (>70%), with minor but important African and Native American contributions. "Whites" and "pardos" from Belém and Ilhéus also were found to be pred. European in ancestry, with minor Native American and African contributions.

According to another study, autosomal DNA study (see table), those who identified as Whites in Rio de Janeiro turned out to have 86.4% - and self identified pardos 68.1% - European ancestry on average. Blacks were found out to have on average 41.8% European ancestry.

Another study (autosomal DNA study, from 2010) found out that European ancestry predominates in the Brazilian population as a whole ("whites", "pardos" and "blacks" altogether). European ancestry is dominant throughout Brazil at nearly 80%, except for the Southern part of Brazil, where the European heritage reaches 90%. "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 towards the ‘‘pardo’’ group". According to it the total European, African and Native American contributions to the Brazilian population are:

In support of the dominant European heritage of Brazil, according to another autosomal DNA study (from 2009) conducted on a school in the poor periphery of Rio de Janeiro the "pardos" there were found to be on average over 80% European, and the "whites" (who thought of themselves as "very mixed") were found out to carry very little Amerindian or African admixtures. "The results of the tests of genomic ancestry are quite different from the self made estimates of European ancestry", say the researchers. In general, the test results showed that European ancestry is far more important than the students thought it would be. The "pardos" for example thought of themselves as 1/3 European, 1/3 African and 1/3 Amerindian before the tests, and yet their ancestry was determined to be at over 80% European. The "blacks" (pretos) of the periphery of Rio de Janeiro, according to this study, thought of themselves as predominantly African before the study and yet they turned out predominantly European (at 52%), the African contribution at 41% and the Native American 7%.

According to another autosomal DNA study from 2009, the Brazilian population, in all regions of the country, was also found out to be predominantly European: "all the Brazilian samples (regions) lie more closely to the European group than to the African populations or to the Mestizos from Mexico". According to it the total European, African and Native American contributions to the Brazilian population are:

According to another autosomal study from 2008, by the University of Brasília (UnB), European ancestry dominates in the whole of Brazil (in all regions), accounting for 65,90% of heritage of the population, followed by the African contribution (24,80%) and the Native American (9,3%).

An autosomal study from 2011 (with nearly almost 1000 samples from all over the country, "whites", "pardos" and "blacks" included) has also concluded that European ancestry is the predominant ancestry in Brazil, accounting for nearly 70% of the ancestry of the population: "In all regions studied, the European ancestry was predominant, with proportions ranging from 60.6% in the Northeast to 77.7% in the South". The 2011 autosomal study samples came from blood donors (the lowest classes constitute the great majority of blood donors in Brazil ), and also public health institutions personnel and health students. In all Brazilian regions European, African and Amerindian genetic markers are found in the local populations, even though the proportion of each varies from region to region and from individual to individual. However most regions showed basically the same structure, a greater European contribution to the population, followed by African and Native American contributions: “Some people had the vision Brazil was a heterogeneous mosaic Our study proves Brazil is a lot more integrated than some expected". Brazilian homogeneity is, therefore, greater within regions than between them:

According to an autosomal DNA study (from 2003) focused on the composition of the Brazilian population as a whole, "European contribution is highest in the South (81% to 82%), and lowest in the North (68% to 71%). The African component is lowest in the South (11%), while the highest values are found in the Southeast (18%-20%). Extreme values for the Amerindian fraction were found in the South and Southeast (7%-8%) and North (17%-18%)". The researchers were cautious with the results as their samples came from paternity test takers which may have skewed the results partly.

Several other older studies have suggested that European ancestry is the main component in all Brazilian regions. A study from 1965, Methods of Analysis of a Hybrid Population (Human Biology, vol 37, number 1), led by the geneticists D. F. Roberts e R. W. Hiorns, found out the average the Northeastern Brazilian to be predominantly European in ancestry (65%), with minor but important African and Native American contributions (25% and 9%). A study from 2002 quoted previous and older studies (28. Salzano F M. Interciêência. 1997;22:221––227. 29. Santos S E B, Guerreiro J F. Braz J Genet. 1995;18:311––315. 30. Dornelles C L, Callegari-Jacques S M, Robinson W M, Weimer T A, Franco M H L P, Hickmann A C, Geiger C J, Salzamo F M. Genet Mol Biol. 1999;22:151––161. 31. Krieger H, Morton N E, Mi M P, Azevedo E, Freire-Maia A, Yasuda N. Ann Hum Genet. 1965;29:113––125. ), saying that: "Salzano (28, a study from 1997) calculated for the Northeastern population as a whole, 51% European, 36% African, and 13% Amerindian ancestries whereas in the north, Santos and Guerreiro (29, a study from 1995) obtained 47% European, 12% African, and 41% Amerindian descent, and in the southernmost state of Rio Grande do Sul, Dornelles et al. (30, a study from 1999) calculated 82% European, 7% African, and 11% Amerindian ancestries. Krieger et al. (31, a study from 1965) studied a population of Brazilian northeastern origin living in São Paulo with blood groups and electrophoretic markers and showed that whites presented 18% of African and 12% of Amerindian genetic contribution and that blacks presented 28% of European and 5% of Amerindian genetic contribution (31). Of course, all of these Amerindian admixture estimates are subject to the caveat mentioned in the previous paragraph. At any rate, compared with these previous studies, our estimates showed higher levels of bidirectional admixture between Africans and non-Africans."