Abstract
The distribution of the phenotypes of the red cell enzymes adenosine deaminase (EC 3.5.4.4), esterase D, glutamate pyruvate transaminase (EC 2.6.1.2) and galactose-1-phosphate-uridyltransferase (EC 2.7.7.12), were studied on a large number of Swiss individuals. The phenotypes of all 4 enzymes were distributed according to the Hardy-Weinberg law, although levels of statistical significance of the differences were not of the same order for all 4 enzymes. Gene frequencies were calculated and in good agreement with data from the literature concerning the Caucasian populations. Among numerous mother-child pairs, no phenotype constellations that were in contradiction to the genetical hypothesis were observed. Phenotypes were distributed identically in men and women.

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