Allozyme polymorphism was studied in 11 Parnassius mnemosyne (Linnaeus, 1758) populations in North-East Hungary. Significant departures from Hardy-Weinberg equilibrium were observed in several cases due to heterozygote deficiency. Genetic variability did not display geographical pattern; the level of genetic differentiation was similar between adjacent populations and between populations originating from different geographical regions. Even a completely isolated population was not differentiated markedly from the others. Thus, genetic drift can be expected as the main evolutionary force acting in the populations.
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