Chromosomal Polymorphism in Thracian Populations of

• Main Authors: Tolga Kankili, Nuri Yüúüt, Teoman Kankili, Kromozom Polimorfizmi
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Key Words; Rattus rattus; karyology; polymorphism; Thrace
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.629.4603; http://journals.tubitak.gov.tr/zoology/issues/zoo-06-30-3/zoo-30-3-13-0511-5.pdf

Abstract: The black rat (Rattus rattus L.) from Thrace is an Oceanian type (2n = 38). Chromosomal analyses show that a polymorphism occurs in chromosome pairs no. 9, 10, and 13 due to pericentric inversions. In the studied populations, the frequencies of homozygous and heterozygous individuals did not differ from the Hardy-Weinberg equilibrium for chromosome pair no. 13. In both Gelibolu and PÝnarhisar populations of R. rattus, a polymorphism due to the supernumerary B-chromosome was found. The R. rattus karyotype with supernumerary chromosomes is reported here for the first time in Turkey. The number of diploid chromosomes are 2n = 38, 2n = 38 + B, and 2n = 38 + 2B. The chromosomal differences were recorded in the number of autosomal arms (NFa), ranging from 58 to 62. The supernumerary metacentric chromosomes were similar in morphology and size to the small metacentric chromosomes of the standard complement of 2n = 38 chromosomes.