Abstract
The pattern of homologous chromosome association at metaphase I of meiosis in rye has been analysed and interpreted by means of the Giemsa C-banding procedure. The rationale for this approach stems from the unexpected coincidence of terminal Giemsa-bands in most chromosome arms and distal chiasma localisation which characterises this species. Analysis of banded metaphase I and anaphase I configurations suggests that meiotic exchanges occur proximal to the terminal Giemsa-bands, that is sub-terminally. The apparently terminal appearance of many chiasmata at metaphase I has been analysed by Giemsa-banding and shown to be more likely to result from bivalent distortion due to contraction and/or stretching (pseudoterminalisation) than from chiasma terminalisation in the accepted sense.
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Jones, G.H. Giemsa C-banding of rye meiotic chromosomes and the nature of “terminal” chiasmata. Chromosoma 66, 45–57 (1978). https://doi.org/10.1007/BF00285815
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DOI: https://doi.org/10.1007/BF00285815