Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Paracentric inversion involving NOR of chromosome 8 in a boar : studies of synaptonemal complexes under a light microscope | 181 Genet Sei Evol 1991 23 181-189 Elsevier INRA Original article Paracentric inversion involving NOR of chromosome 8 in a boar studies of synaptonemal complexes under a light microscope M Switonski Academy of Agriculture Department of Genetics and Animal Breeding Wolynska 33 p1-60-637 Poznan Poland Received 13 June 1990 accepted 28 January 1991 Summary - In the karyotype of a boar used in artificial insemination a paracentric inversion inv 8 pll pl2 involving approximately 8 of the chromosome length was identified. The inversion split the nucleolar organizer region NOR into 2 segments. An analysis of synaptonemal complexes carried out under a light microscope revealed that in a majority of primary spermatocytes heterosynaptic straight pairing in pair No 8 occurred. In the remaining cells delayed pairing was found in this pair. The loop formation was not identified in any of the studied spermatocytes. In addition no nonspecific associations between sex bivalent and autosomal bivalents were found. Consequences of the observed pairing behavior on fertility are discussed. swine chromosomal aberration inversion synaptonemal complex Resume - Inversion paracentrique impliquant 1 organisateur nucléolaire du chromosome 8 Chez un verrat étude des complexes synaptonémiques au microscope optique. Dans le caryotype d un verrat utilise en insemination artificielle une inversion paracen-trique inv 8 pll pl2 impliquant approximativement 8 de la longueur du chromosome a été identifiee. L inversion partage la region de I organisateur nucléolaire NOR en 2 segments. L analyse des complexes synaptonémiques réalisée au microscope optique révệle que chez la majorite des spermatocytes primaires 87 2 1 hétérosynapsis de la paire n 8 intervient rapidement. Dans le reste des cellules I appariement pour cette paire est retardé. Aucune formation de bouclé d inversion n a été observée chez les spermatocytes étudiés. En outre aucune association non specifique n a été trouvée entre des .
