Open AccessChromosome polymorphism in the root vole ( Microtus oeconomus )
Author(s) -
FREDGA KARL,
BERGSTRÖM ULF
Publication year - 1970
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1970.tb02340.x
Subject(s) - biology , karyotype , autosome , microtus , chromosome , genetics , ploidy , vole , population , zoology , gene , sociology , demography
The karyotypes of root voles, Microtus oeconomus (P allas ) from different localities in Fennoscandia are described. The basic chromosome number is 2 n =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 (2 n =31) and four (2 n =32) telocentric chromosomes were found.