棕色田鼠的G、C带研究  

The G、C-Banding Study of Microtus Mandarinus

作　　者：李震 朱必才[2] 高焕[2] 李爱玲[2] 张永[2] 

机构地区：[1]山东省医疗器械研究所,济南250014 [2]徐州师范大学,徐州222116

出　　处：《生物医学工程研究》2002年第1期40-43,共4页Journal Of Biomedical Engineering Research

摘　　要：本文对棕色田鼠G、C带核型进行分析和研究 ,描述了G显带特征。所研究的 10只个体的第一对常染色体 (No .1)存在 3种多态类型 ,即 (1)全部由中部着丝粒染色体组成 ;(2 )只存在一条中部着粒丝染色体 ;(3)无中部着粒丝染色体。这是由罗伯逊易位引起的 ,本文并对此作了讨论 ,认为棕色田鼠的核型进化趋势以第一对常染色体发生罗伯逊断裂的可能性更大。本文还以G、C带核型为依据 ,证实了雌雄X性染色体存在着多态现象 :一条是中部着丝粒染色体 ,一条是亚中部着丝粒染色体。The G、C-banding-Karyotype of Microtus mandarinus are researched in the paper,and the characters of G-banding are limned.There are three kinds of polymorphic type in the first pair chromosomes in ten individuals studied.That is ,(1)both are metachromosomes;(2)only one metachromosome;(3)without metachromosome.This is caused by Robertsonian Translocation.We think the evolution tredency of karyotype of Microtus mandarinus may be robertsonian fission of No.1. Additionally,we also assure there are polymorphic types in X ses chromosomes of male and female,through the comparision of their G and C bands,and one is metachromatic chromosome,the other is subchromatic chromosome.

关 键 词：棕色田鼠 染色体多态 G、C带核型 罗伯逊易位 

分 类 号：Q3[生物学—遗传学]