title: Unequal X chromosomes in Bradysia hygida (Diptera:Sciaridae) females: karyotype assembly and morphometric analysis.
abstract: The mitotic chromosomes of Bradysia hygida (Diptera:Sciaridae) neuroblast cells are described together with their morphometric data. Giemsa-stained neuroblast chromosomes from female and male larvae confirm the chromosome number of this species, 2n = 8 (XX) and 2n = 7 (XO), respectively. The karyotype assembly reveals two metacentric autosomic pairs, the A and B chromosomes; a subtelocentric, the C chromosome, the smallest one; and a sexual unequal metacentric pair, X chromosome, in female karyotype and a one sexual metacentric X chromosome in male. The implications of the unequal X chromosome pair are discussed.
authors.affiliation: Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Paraná, Brasil.
authors.forename: A R
authors.initials: AR
authors.lastname: Borges
authors.forename: V P
authors.initials: VP
authors.lastname: Gaspar
authors.forename: M A
authors.initials: MA
authors.lastname: Fernandez
mesh_terms: D000818:Animals; D001399:Azure Stains; D004175:Diptera / Q000235:genetics*; D005260:Female; D007621:Karyotyping; D007814:Larva / Q000166:cytology; D008297:Male; D008677:Metaphase / Q000235:genetics; D008938:Mitosis; D009474:Neurons / Q000648:ultrastructure; D012737:Sex Factors; D013234:Stem Cells / Q000648:ultrastructure; D014960:X Chromosome / Q000235:genetics*
chemical_list: D001399:Azure Stains