Numerous chromosomal polymorphisms in a natural population of rice rats (Oryzomys, Cricetidae)
作者:
B.F. Koop,
R.J. Baker,
H.H. Genoways,
期刊:
Cytogenetic and Genome Research
(Karger Available online 1983)
卷期:
Volume 35,
issue 2
页码: 131-135
ISSN:1424-8581
年代: 1983
DOI:10.1159/000131854
出版商: S. Karger AG
数据来源: Karger
摘要:
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.
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