Contribution to the study of the taxonomy and zoogeography of wild house mouse, genus Mus L. (Mammalia, Rodentia, Muridae) in Greece. II. Karyological study of two populations from southern Greece

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Abstract
The karyological study of two wild populations of mouse (Mus musculus domesticus) established the existence of Rb-metacentric chromosomes in the karyotype. The chromosome composition was determined by G-banding technique. The two populations were closely related because they were characterized by Rb-metacentric chromosomes of the same composition. The individuals of populations 1 had 2n = 30 and 29 displaying 10 and 11 metacentrics, while the individuals of population II had 2n = 30, 31 and 32 with 10, 9 and 8 metacentrics respectively. The Rb (15.13) metacentric chromosome found in both populations was referred here for first time. In meiotic metaphase I of heterozygous males (2n = 29 and 31) one trivalent was observed. The occurence of many heterozygous individuals indicates the presence of a hybrid zone in the region.