Abstract
A case of stable polymorphism in one pair of homologous chromosomes in Leopoldia comosa (L.) Parl. (2n = 18) is described. Four alternative types of one chromosome were found in different combinations. The four chromosome types differ in r-values and in length. A pericentric inversion is presumed to cause the difference in r-values. Within the same population cytotypes with both homologous chromosomes without inversion, with one of the homologous chromosomes with the inversion and with both homologous chromosomes with the inversion usually coexist. The proportions of the different cytotypes found in the different populations were in close agreement with the proportions calculated from the Hardy-Weinberg law. The frequencies of the different chromosome types differ conspicuously, two types being far more frequent than the other two.
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