Abstract
Distances between marked pairs of bivalents were determined at first meiotic metaphase of common wheat (2n=6x=42; genome AABBDD) by tallying the number of bivalents intervening between the marked bivalents. Bivalents of the same genome tended to lie relatively close to one another, whereas those of different genomes were further apart on the metaphase plate. Within each genome the association of telocentric bivalents representing the two different arms of one chromosome was much more intimate than that of genetically nonrelated bivalents. Among chromosomes of different genomes, homoeologous bivalents were relatively closer to one another than nonrelated ones. These results were more pronounced in cells with circularly arranged bivalents on the metaphase plate than in those with a linear arrangement. The data, consistent with previous findings in cold-treated somatic cells, indicate that a similar pattern of chromosomal arrangement exists in somatic and meiotic cells and that chromosomal arrangement observed in arrested metaphases is also maintained on the untreated, functional spindle system.
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Yacobi, Y.Z., Levanony, H. & Feldman, M. An ordered arrangement of bivalents at first meiotic metaphase of wheat. Chromosoma 91, 347–354 (1985). https://doi.org/10.1007/BF00291006
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DOI: https://doi.org/10.1007/BF00291006