Ahmet Yesari SELÇUK, Mehmet Akif BİLİR, Haluk KEFELİOĞLU

Microtus guentheri, Microtus arvalis ve Microtus majori (Mammalia: Rodentia) Türlerinin Sitogenetik Özellikleri: Konstitütif Heterokromatin Dağılımı

Bu çalışmada, Güentheri tarla faresi (Microtus guentheri), Kısa kulaklı kır faresi (Microtus majori) ve Yaygın tarla faresi (Microtus arvalis) türlerinin standart karyotipleri ve kromozomların C-bant özellikleri belirlendi. M. guentheri türünün diploid kromozom sayısı (2n) = 54 ve otozomal kromozomların kol sayısı (NFa) = 52, M. arvalis (obscurus sitotip) türünün 2n = 46 ve NFa = 68, M.majori türünün 2n = 54 ve NFa = 56 şeklindedir. M. guentheri otozomal ve eşey kromozomlarda pericentromerik C-bant olduğu belirlendi. Microtus arvalis (obscurus sitotip) ve Microtus majori karyotiplerinde otozomal kromozomlar C bant pozitif ve negatif şeklindedir. M. arvalis türünde X ve Y kromozomu C bant negatif özelliktedir. M. majori karyotipinde X kromozomunun uzun kolunda sentromerden telomere doğru genişlemiş heterokromatin blok bulunmaktadır. Y kromozomu ise tamamen heterokromatindir.

Cytogenetic Characteristics of Microtus guentheri, Microtus arvalis sensu lato and Microtus majori (Mammalia: Rodentia) From Turkey: Constitutive Heterochromatin Distribution

Conventionally stained and C- banded karyotypes of Guenther’s vole(Microtus guentheri), Major's pine vole (Microtus majori) andCommon vole (Microtus arvalis) were studied from Turkey. Diploidchromosome numbers of M. guentheri, M. arvalis and M. majori werefound as 2n=54 and NFa=52, 2n=46 and NFa=68 and 2n=54 andNFa=56, respectively. All chromosomes of M. guentheri werepericentromeric C- band. In Microtus arvalis (obscurus cytotype) andMicrotus majori karyotypes, autosomal chromosomes wereheterochromatin C band positive and negative band. In M. arvalis(obscurus cytotype), sex chromosome was C band negative. In thisstudy, heterozygote chromosome was not found in the obtainedautosomal chromosome set of M. arvalis. M. majori has enlargedheterochromatin block from centromere to telomere on the long armof X chromosome. Y chromosome was completely heterochromatin.

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