Chromosome polymorphism in the root vole (Microtus oeconomus).
Chromosome polymorphism in the root vole (Microtus oeconomus).
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根田鼠（Microtus oeconomus）的染色体多态性。
DOI：
10.1111/j.1601-5223.1970.tb02340.x
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发表时间：
2009
期刊：
影响因子：
2.7
通讯作者：
U. Bergström
中科院分区：
文献类型：
--
作者：
K. Fredga;U. Bergström
本文描述了产于芬诺斯堪的亚不同地区的根田鼠Microtus oeconomus（Pallas）的核型。染色体基数为2n=30。常染色体对按其着丝粒位置可分为三种类型：第11对、第2对和第1对。sm1和sm2分别是最长和最短的染色体。X染色体，通过放射自显影鉴定，是一条m染色体，占雌性单倍体总长度的6.0%。Y染色体是一条st染色体，是核型中第二短的染色体。
在一个孤立的根田鼠种群中发现了罗伯逊型染色体多态性。它是由一对染色体（m8）的着丝粒分裂引起的。野生捕获的动物有两个（2n=31）和四个（2n=32）端部着丝粒染色体被发现。
The karyotypes of root voles, Microtus oeconomus (Pallas) from different localities in Fennoscandia are described. The basic chromosome number is 2n=30. The autosome pairs may be divided into three types on the basis of centromeric location: 11 m, 2 sm and 1 st chromosome pairs. The sm1 and sm2 are the longest and shortest chromosomes of the karyotype, respectively. The X chromosome, identified by autoradiography, is an m chromosome constituting 6.0 per cent of the total length of the female haploid set. The Y chromosome is an st chromosome and the next shortest chromosome of the karyotype.
In an isolated population of root voles chromosomal polymorphism of the Robertsonian type was discovered. It was caused by centric fission of one chromosome pair (m8). Wild-captured animals with two (2n=31) and four (2n=32) telocentric chromosomes were found.