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Analysis of the frequency of karyotypes and chromosomal rearrangements in the distributional ranges of four metacentric races of    Sorex   araneus    Linnaeus, 1758 has revealed features that are not typical for polymorphic populations of this species. The frequency of the acrocentric karyotype and heterozygotes for fusion of acrocentric chromosomes turned out to be significantly higher than expected in case of random crossing. As an explanation for the unusual polymorphism, it has been suggested that metacentric races may hybridize with acrocentric populations that remained from the ancient chromosomal form.

Unusual chromosomal polymorphism of the common shrew, Sorex araneus L., in southern Belarus