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Cytogenetic Study on Microtus guentheri (Danford and Alston, 1880) (Mammalia: Rodentia) from Turkey: Constitutive Heterochromatin Distribution and Nucleolar Organizer Regions
(Polish Acad Sciences, Inst Systematics Evolution Animals, 2011) Baydemir, Nurse Asan; Albayrak, Irfan; Gozutok, Serdar
Conventionally stained, C- and Ag-NOR banded karyotypes of Guenther's vole, Microtus guentheri were studied from Turkey. The species possesses a karyotype of 2n=54, NFa=52 and NF=54 in specimens from Kahramanmaras and Gaziantep provinces, whereas NF=56 in females and NF=55 in males were found in individuals from Kirikkale and Nevsehir provinces. The X chromosome was a large acrocentric (NF=54) or submetacentric (NF=55, 56) while the Y chromosome was a small telocentric in all specimens examined. Blocks of constitutive heterochromatin were located in the pericentromeric areas of autosomes including the X chromosome. Nucleolar organizer regions (NORs) were located at the telomeric regions of the short arms of five acrocentric pairs and centromeric regions of two telocentric pairs in the Nevsehir and Kirikkale specimens.