title: Cytogenetic study on Microtus guentheri (Danford and Alston, 1880) (mammalia: rodentia) from Turkey: constitutive heterochromatin distribution and nucleolar organizer regions.
abstract: 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 Kahramanmaraş and Gaziantep provinces, whereas NF = 56 in females and NF = 55 in males were found in individuals from Kirikkale and Nevşehir 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 Nevşehir and Kirikkale specimens.
authors: University of Kirikkale, Faculty of Science and Arts, Department of Biology, 71451 Yahşihan, Kirikkale, Turkey. nurselasan@yahoo.com
authors: Nursel Aşan
authors: NA
authors: Baydemir
authors: Irfan
authors: I
authors: Albayrak
authors: Serdar
authors: S
authors: Gözütok