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Vol. 35, No. 2, 1983
Issue release date: 1983
Cytogenet Cell Genet 1983;35:131–135
Original Article

Numerous chromosomal polymorphisms in a natural population of rice rats (Oryzomys, Cricetidae)

Koop B.F. · Baker R.J. · Genoways H.H.
The Museum, Texas Tech University, Lubbock, Tex.


Based on G- and C-banded karyotypes of 10 specimens of rice rats, genus Oryzomys (a member of the macconnelli-capito complex but species identification is not possible at this time) from a single isolated population, we found at least nine different centric fusion/fission polymorphisms. No two individuals examined had the same karyotype. Polymorphic variation appears to be stable in the population and not the result of hybridization, human disturbance, or non-specific mutagenic agents. Among the 14 largest chromosomes, polymorphism is restricted to fusion/fission rearrangements. Among the smaller ones, there is polymorphism in the total number of euchromatic arms, which indicates that rearrangements other than fusion/fission exist within our sample. Data from these rice rats document the presence of a greater number of chromosomal polymorphisms within a single, natural population than have previously been reported in a higher vertebrate.

 goto top of outline Author Contacts

Request reprints from: Dr. Robert J. Baker, The Museum, Texas Tech University, Box 4499, Lubbock, TX 79409 (USA).

 goto top of outline Article Information

Received:: 12 August 1982
Published online: May 07, 2008
Number of Print Pages : 5

 goto top of outline Publication Details

Cytogenetic and Genome Research

Vol. 35, No. 2, Year 1983 (Cover Date: 1983)

Journal Editor: Schmid M. (Würzburg)
ISSN: 1424–8581 (Print), eISSN: 1424–859X (Online)

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