title: Cytogenetic analysis of great horned owls (Bubo virginianus).
abstract: A chromosome analysis of seven great honored owls (Bubo virginianus, Gmelin) has been performed on peripheral lymphocytes. The modal chromosome number was found to be 2n = 82. Measurements of relative lengths and arm ratios of the macrochromosomes were made. All chromosomes contain a region of constitutive heterochromatin in a centromeric location, with the W chromosome being composed almost entirely of this material. Chromosome replication, as demonstrated by the BudR-acridine orange method, showed synchronous replication of the two Z chromosomes of the male and late replication of the W chromosome of the female. In this species, functional regions of nucleolar organization appear to be localized to the microchromosomes.
mesh_terms: D000165:Acridine Orange; D000818:Animals; D001717:Birds / Q000235:genetics*; D001973:Bromodeoxyuridine; D002871:Chromosome Banding; D002875:Chromosomes / Q000378:metabolism / Q000648:ultrastructure*; D004261:DNA Replication; D005260:Female; D006570:Heterochromatin; D007621:Karyotyping; D008214:Lymphocytes; D008297:Male; D009697:Nucleolus Organizer Region
chemical_list: D006570:Heterochromatin; D000165:Acridine Orange; D001973:Bromodeoxyuridine