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- W2000973977 abstract "B-chromosome and sex chromosome polymorphisms in 11 populations of Galerucella nymphaeae in Finland and one population in Sweden were studied. In addition to the standard karyotype 2n = 34 (16 + Xyp), B-chromosomes were found in varying frequencies (3.2–49.2 %) in every population studied, and an exceptionally large Y chromosome occurred in varying frequencies (0.0–48.0 %) in 9 Finnish populations. The variation in frequencies of both polymorphisms was geographically random, and no correlation between the two polymorphisms could be found. However, the frequencies seemed to stay at a constant level from year to year, if the population was in a steady state. B-chromosomes varied in size from smaller than the small Y chromosome to autosome- sized B's. All B's were largely euchromatic and able to form chiasmatic bivalents. They were isopycnotic during meiotic prophase and segregated normally. On the basis of their behavior, B's could be divided into mitotically stable and unstable. The behavior of the large Y chromosome was similar to that of the small Y. Usually, the large Y chromosome associated side by side with the X in the parachute bivalent, but sometimes it was observed associating via one end. In evolutionary sense, the large Y chromosome must be of very recent origin. Both polymorphisms seemed to be adaptively neutral. The presence of neither B-chromosomes nor the large Y chromosome could be detected from the external phenotype of the individuals." @default.
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- W2000973977 date "2008-02-14" @default.
- W2000973977 modified "2023-09-25" @default.
- W2000973977 title "Chromosomal polymorphisms in Galerucella nymphaeae (L.) (Chrysomelidae, Coleoptera) in Finland" @default.
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- W2000973977 doi "https://doi.org/10.1111/j.1601-5223.1989.tb00387.x" @default.
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