the complex robertsonian system of dichroplus pratensis (melanoplinae, acrididae). i. geographic distribution of fusion polymorphisms复杂的罗伯逊的系统dichroplus pratensis(melanoplinae acrididae)。.pdf

Original article The complex Robertsonian system of Dichroplus pratensis (Melanoplinae, Acrididae). I. Geographic distribution of fusion polymorphisms CJ Bidau C Belinco P Mirol3D Tosto 1 Universidad Nacional de Misiones, Departamento de Genética, Facultad de Ciencias Exactas, Quimicas y Naturales, Félix de Azara 1552, 6°Piso, 3300 Posadas, Misiones, Argentina; 2 Biological Sciences Center, Dept of Genetics and Cell Biology, 1!,l,5 Gartner Ave, St Paul, MN, USA; Dept3Ciencias Biolôgicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Laboratorio de Genética, 1428 Buenos Aires, Argentina (Received 20 July 1990; accepted 17 June 1991) A chromosomal survey was performed in natural populations of Summary- Argentine the South-American melanopline grasshopper Dichroplus pratensis Bruner (Acrididae). The cytogenetic study of samples from different populations revealed the existence of at least 7 distinct Robertsonian translocations which involve the 6 L (large) autosomes of the 2n = 20 all-telocentric standard karyotype. Some of the fusions thus share (Q)/19 d)( monobrachial homologies. The Robertsonian variation found in D ratensisPis discussed in relation to a model of chromosomal evolution for the species in which the changes in recombination patterns produced by the fusions are central. centric fusion / polymorphism / polytypism / grasshopper Résumé mdash; Le système robertsonien complexe de Dichroplus pratensis (Melanoplinés, Acrididés). I. Distrib