Despite the fact Mulattos (individuals resulting from admixture of Caucasian and Black individuals) represent one of the most common racial mixed individuals not only in Brazil but in many other countries, there is little information regarding the distribution of blood groups among them. We studied 2,462 blood donors classified as Caucasian, Mulattos e Blacks according to their anthropological characteristics as well as to their ancestry information. Phenotype frequencies were studied in the ABO, MNS, P, Rh, Lutheran, Kell, Lewis, Duffy e Kidd blood group systems. We did not find significant statistically difference between Blacks and Mulattos for the majority of the blood groups systems here reported, excepting of P1 positive, Dccee, Le(a-b-), Js(a+b+), Js(a-b+), Fy(a-b-), Fy(a+b+) e Fy(a-b+). On the other he there was a significant difference between Caucasian and Blacks for the following red blood cells phenotypes: A, B, M+N-S+s-, M+N-S-s+, P1 positivo, ddccee, Dccee, Dccee, DCCee, DccEe, K+k+, K-k+, Kp(a-b+), Kp(a+b+), Js(a-b+), Js(a+b-), Le(a-b+), Le(a-b-), Fy(a-b+), Fy(a+b+), Fy(a-b-), Jk(a+b-), Jk(a+b+) e Jk(a-b+). Conclusion: As expected, the results for the Mulattos group were intermediate between Caucasian and Blacks, with strong Negroid influence.
blood groups; statistics; blood donors
