title: Protostrongylus rufescens: a cytogenetic study.
abstract: The diploid chromosome number of Protostrongylus rufescens is 2n = 11 for males and 2n = 12 for females. So, the sex determinism mechanism is XO/XX. The study of the genetic behaviour of this species has been made. In diakinesis stage the bivalents show typical tetrads with cross, phi, and lineal configurations. The division of the sexual chromosome is prereductional for the first meiotic division.
mesh_terms: D000818:Animals; D002455:Cell Division; D002875:Chromosomes / Q000502:physiology*; D005260:Female; D006041:Goats; D008297:Male; D008540:Meiosis; D008938:Mitosis; D009348:Nematoda / Q000166:cytology / Q000235:genetics*; D012730:Sex Chromosomes / Q000502:physiology*; D012756:Sheep