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.

中文翻译：

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白俄罗斯南部常见鼩鼱Sorex araneus L. 的异常染色体多态性

对 Sorex araneus Linnaeus, 1758 的四个中中心种族分布范围内的核型和染色体重排频率的分析揭示了该物种多态性种群不典型的特征。在随机杂交的情况下，用于近端着丝粒染色体融合的近端着丝粒核型和杂合子的频率明显高于预期。作为对不寻常的多态性的一种解释，有人提出后着丝粒种族可能与从古代染色体形式遗留下来的上着丝粒种群杂交。