Szukana fraza: [Opis = "Spatial and temporal distribution of supernumerary or B chromosomes were studied in natural populations of wood mice. A total of 859 individuals belonging to several species from Eurasia were examined. A very high percentage of individuals possessing B chromosomes was found in Apodemus peninsulae \(97.9%, n = 47\), a high percentage in A. flavicollis \(42.5%, n = 362\), and a low one in A. sylvaticus \(2.4%, n = 210\). No B chromosomes were observed in A. uralensis \(n = 10\), A. fulvipectus \(n = 19\), A. hermonensis \(n = 1\), A. agrarius \(n = 58\), A. mystacinus \(n = 7\), and in Apodemus species collected in Turkey \(n = 74\), Israel \(n = 1\), Azerbaijan \(n = 2\), Tadjikistan \(n = 24\), and Kyrghyzstan \(n = 44\)."]

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