title: Studies on the karyotype and gametogenesis in Trichuris muris.
abstract: The cytological study of males and females of Trichuris muris (Schrank, 1788) revealed the diploid number of chromosomes to be 2n = 6. The sex determining mechanism was XX female/XY male. All the chromosomes were subtelocentric. Sex chromosomes formed the smallest pair, but X and Y were difficult to distinguish morphologically. Chromosome changes during gametogenesis in both sexes followed a classical pattern except in the male prophase and metaphase I. Four male autosomes formed two bivalents, each with one proximal chiasma with strict localization, while sex chromosomes X and Y formed two univalents. Female chromosomes formed three rod bivalents of normal type, which possessed three, two and two chiasmata.
authors.affiliation: Parasitological Institute, SAS, Kosice, Slovak Republic.
authors.forename: M
authors.initials: M
authors.lastname: Spakulová
authors.forename: I
authors.initials: I
authors.lastname: Králová
authors.forename: C
authors.initials: C
authors.lastname: Cutillas
mesh_terms: D000818:Animals; D004171:Diploidy; D005260:Female; D005718:Gametogenesis; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D008677:Metaphase; D051379:Mice; D008813:Mice, Inbred ICR; D008938:Mitosis; D012730:Sex Chromosomes; D013047:Specific Pathogen-Free Organisms; D014258:Trichuris / Q000235:genetics* / Q000502:physiology*