【作者】 迪丽都孜·铁尔曼； 张敏； 朱必才；

【Author】 TELMAN Dilduz ZHANG Min( Xinjiang Normal University, Urumqi 830054, China) ( Shaanxi Teacher’s University, Xi’an 710062, China)ZHU Bi-Cai ( Xuzhou Teacher’s University, Xuzhou 221009, China)

【机构】 新疆师范大学生物系； 陕西师范大学生命科学学院； 徐州师范大学生物系；

【摘要】 首先对棕色田鼠三种染色体数目的雄性个体(2n=50,51,52)进行核型分析,发现第一对常染色体(No.1)具有罗伯逊式多态.然后对2n=51个体进行染色体G带及精母细胞联会复合体电镜研究.研究结果证实罗伯逊易位是引起该鼠第一对常染色体类型及个体染色体数目多态的主要原因.本文还认为第一对染色体进化机制是罗伯逊断裂,探讨了影响着丝粒银染着色的因素.更多还原

【Abstract】 The karyotype analyses of male mandarin vole (2n=50,51, 52) presented the Robertso-nian polymorphism of pair 1 (chromosome No. 1) . G-banding karyotypes and silver-stained SCs in surface-spread pachytene nuclei from the male vole (2n=51, the presumptive Robert-sonian heterozygotes) were studied by the means of light and electron microscopes, respectively. G-banding studies indicate that the bands on the No. 1 (metacentric) coincide well with the bands on the two telocentrics which have no telocentric pairs in the karyotype, SCs studies demonstrate that there is an autosomal trivalent in pachytene nuclei, which formedby one metacentric and two telocentric elements and characterized by the presence oi two short side arms. Kinetochore and telomere position could be determined in our silver stained preparations.更多还原