Abstract
The Carabelli trait in South African negroids, caucasoids, Coloured (Peninsula and Namaqualand) and Indians, classified according to Alvesalo, Nuutila and Portin (1975; Acta odont. scand. 33, 191–197) showed generally peak frequency of expression for dm 2 falling into class 3 and for M 1 into class 4, that dm 2 displays more negative expression (class 2 and 3) and M 1 more positive expression (class 4 and 5) and that overall expression in dm 2 is higher than in M 1. The Indian group was an exception with peak frequencies in class 2 for dm 2 and class 1 (right) and class 2 (left) for M 1. There was no sex dimorphism and there was a tendency for concordance of expression between sides but not within sides.
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