Summary
The effect of a supernumerary heterochromatic segment on non-homologous chromosome associations has been investigated in the grasshopper Camula pellucida. A supernumerary segment located in one of the smallest chromosomes of the complement is associated with a substantial increase in the frequency of non-homologous chromosome associations at diplotene of meiosis. Bivalents that are segmented enter into more non-homologous chromosome associations than non-segmented bivalents. The non-homologous associations are completely resolved prior to metaphase II of meiosis. Both segmented and non-segmented chromosomes are randomly arranged in the radial metaphase II configuration.
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Darlington, C D. 1936. Crossing-over and its mechanical relationships in Chorthippus and Stauroderus. J Genet, 33, 465–500.
Hewitt, G M. 1967. An interchange which raises chiasma frequency. Chromosoma (Berl), 21, 285–295.
Hewitt, G M, and John, B. 1968. Parallel polymorphism for supernumerary segments in Chorthippus parallelus (Zetterstedt). I. British populations. Chromosoma (Berl), 25, 319–342.
John, B, and Hewitt, G M. 1965a. The B-chromosome system of Myromeleotettix maculatus (Thumb.). I. The Mechanics. Chromosoma (Berl), 16, 548–578.
John, B, and Hewitt, G M. 1965b. The B-Chromosome system of Myromeleotettix maculatus (Thumb.). II. The statics. Chromosoma (Berl), 17, 121–138.
John, B, and Hewitt, G M. 1966. A polymorphism for supernumerary segments in Chorthippus parallelus. Chromosoma (Berl), 18, 254–271.
John, B, and Hewitt, G M. 1969. Parallel polymorphism for supernumerary segments in Chorthippus parallelus (Zetterstedt). III. The Ashurst population. Chromosoma (Berl), 28, 73–84.
Jones, N R, and Rees, H. 1967. Genotypic control of chromosome behaviour in rye. XI. The influence of B chromosomes on meiosis. Heredity, 22, 333–347.
Koul, A K. 1964. Heterochromatin and non-homologous associations in Coix aquática. Chromosoma (Berl), 15, 243–245.
Lewis, E B. 1950. The phenomenon of position effect. Advances in Genetics, 3, 73–115.
Li, Ning, and Jackson, R C. 1961. Cytology of supernumerary chromosomes in Haploppapus spinulosus SSP. Cotula. Am J Botany, 48, 419–426.
Lucchesi, J C, and Suzuki, D T. 1968. The interchromosomal control of recombination. Annual Review of Genetics, 2, 53–86.
Lyon, M F. 1962. Sex chromatin and gene action in mammalian X chromosome. Amer J Hum Genet, 14, 135–148.
Nur, U. 1973. Random arrangement of chromosomes in a radial metaphase configuration. Chromosoma (Berl), 40, 273–267.
Shaw, D D. 1970. The supernumerary segment system of Stethophyma. I. Structural basis. Chromosoma (Berl), 30, 326–343.
Shaw, D D. 1971. The supernumerary segment system of Stethophyma. II. Heterochromatin polymorphism and chiasma variation. Chromosoma (Berl), 34, 19–39.
Southern, D I. 1967. Pseudo-multiple formation as a consequence of prolonged non-homologous chromosome association in Metrioptera brachyptera. Chromosoma (Berl), 21, 272–284.
Southern, D I. 1970. Polymorphism involving heterochromatic segments in Metrioptera brachyptera. Chromosoma (Berl), 30, 154–168.
Vanderlyn, L. 1949. The heterochromatin problem in cytogenetics as related to other branches of investigation. Bot Rev, 15, 507–582.
Westerman, M. 1969. Parallel polymorphism for supernumerary segments in Chorthippus parallelus (Zetterstedt). II. French populations. Chromosoma (Berl), 26, 7–21.
Wimber, D E, and Steffenson, D M. 1973. Localization of gene function. Annual Reviews of Genetics, Vol. 7, in press.
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Church, K. The effect of supernumerary heterochromatic chromosome segments on non-homologous chromosome associations in the grasshopper Camula pellucida. Heredity 33, 151–158 (1974). https://doi.org/10.1038/hdy.1974.83
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DOI: https://doi.org/10.1038/hdy.1974.83
