CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Karyotype and Pattern of Chromosome Replication in Lagurus lagurus Pall (Cricetidae, Microtinae)
M. R. BanerjeeRuby J. Walker
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JOURNAL FREE ACCESS

1968 Volume 33 Issue 2 Pages 181-187

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Abstract

Karyotype from somatic and germ cells of Lagurus lagurus Pall (Steppe-Lemming) a species of Microtinae, showed 54 chromosomes in the diploid set with XY and XX sex-chromosome mechanisms. The autosomes were classified into 3 morphological groups. The Y chromosome is a small acrocentric element and its identification in the male karyotype is rather difficult among the autosomes. Characteristic size and morphology of the X-chromosome, however, permits its positive identification. All the autosomal bivalents showed at diakinesis at least one chiasma and the X and the Y chromosomes are associated end to end. There are two types of metaphase II cells, a Y class and an X class, resulting from the reductional segregation of the sex-chromosomes. The general pattern of DNA replication, both in somatic and germ cells is in agreement with other rodents so far studied.

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© The Japan Mendel Society
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