title: Chromosome elimination in Ctenocephalides orientis (Siphonaptera).
abstract: Somatic and egg squashes of Ctenocephalides orientis exhibited a chromosome complement of 2n = 14,XY/XX, whereas the spermatocytes showed 2n = 15,XY1 Y2. The sex trivalent was restricted to spermatogenesis; in oogenesis only one sex bivalent was formed. Elimination of one of the Y chromosomes from the somatic cells was evident.
mesh_terms: D002875:Chromosomes / Q000502:physiology* / Q000648:ultrastructure; D005260:Female; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D008938:Mitosis; D009866:Oogenesis; D005423:Siphonaptera / Q000502:physiology / Q000648:ultrastructure*; D013091:Spermatogenesis