PMID: 1212898Dec 29, 1975Paper

The cytogenetic structure of Tasmanian populations of Phaulacridium vittatum

Chromosoma
B John, M Freeman

Abstract

In 8 out of 20 Tasmanian populations of Phaulacridium vittatum from 0.3-11.0 percent of the males carried a single supernumerary chromosome. In such males the X and B univalents are both heteropycnotic at first prophase of male meiosis and associate with another in a non-homolgous manner in about two-thirds of the diplotene cells examined. In all 56 B-containing individuals studied, however, these associations lapse by first metaphase and the X and the B move at random with respect to one another at first anaphase. The supernumerary in this species is stable and only 5 of the 56 individuals with supernumeraries showed evidence of B-chromosome non-disjunction in the pre-meiotic mitoses. Since there was no other evidence for the loss or gain of supernumeraries in the male line it is clear that B-transmission is regular in the males of this species. There were significant differences between population with respect to mean cell chiasma frequency but there was no significant effect of the B-chromosome on this metric. Additionally a comparison of mean cell chiasma frequency in follicles with and without supernumeraries from a mosaic individual shows no significant difference.

References

Feb 1, 1975·Heredity·M Westerman
Jun 11, 1974·Chromosoma·B John, M Freeman

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Citations

Jan 1, 1996·Chromosome Research : an International Journal on the Molecular, Supramolecular and Evolutionary Aspects of Chromosome Biology·M D López-LeónJ P Camacho
Oct 25, 2002·Proceedings. Biological Sciences·J P M CamachoF Perfectti
Mar 25, 2011·Sexual Development : Genetics, Molecular Biology, Evolution, Endocrinology, Embryology, and Pathology of Sex Determination and Differentiation·J P M CamachoJ Cabrero
Mar 10, 1976·Chromosoma·B John

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