Abstract
C 3 type determinations were performed in 2,454 unrelated Norwegians. The following frequencies were found for the 2 common alleles at the C 3 locus: C 3S= 0.7865 and C 3F = 0.2082. Nine different variant phenotypes were found in 26 individuals. No heterogeneity in phenotype distribution between different regions of Norway was observed. It was shown that no association exists between C 3 phenotypes and sex. The allele frequencies of this material resemble those of other Caucasian population groups tested closely, but differ significantly from the allele frequencies of Negro, Oriental and Lappish populations tested.

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