Abstract
SummaryData are presented concerning the distribution of the ABO, MN and Rh blood groups and the saliva AB-secretion in the endogameous population ofIvád(Ivády family). Although a greater frequency of the A-, M-, and D-genes was observable, the differences between theIvádyfamily and the surrounding populations from where the family originated, were not significant. Isoagglutinin and bacterial agglutinin titres showed a narrower variation atIvádthan inBudapest. No agammaglobulinaemia or a higher frequency of Rhesus isoimmunization was observable. The most prominent feature of theIvádyisolate was the conservation of the original gene frequencies. The effect of random genetic drift or of selection was not demonstrable as far as the genes investigated are concerned.
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