title: Cytogenetics of bisexual/unisexual species of Poecilia. II. Analysis of heterochromatin and nucleolar organizer regions in Poecilia mexicana mexicana by C-banding and DAPI, quinacrine, chromomycin A3, and silver staining.
abstract: Chromosomes of Poecilia mexicana mexicana, one of the bisexual species involved in the hybrid origin of the unisexual teleost fish species P. formosa, were analyzed by several staining techniques. Sex-specific, differential heterochromatin, found in other congeneric species, was not observed in P. m. mexicana. Nucleolar organizer regions were polymorphic among individual specimens within a given population sample. A single specimen exhibiting intraindividual variability of chromosome pair 1 and a specimen with a triploid karyotype are also described.
authors.affiliation: Dipartimento di Biologia Animale e dell'Uomo, Università di Roma La Sapienza, Italy.
authors.forename: L
authors.initials: L
authors.lastname: Sola
authors.forename: A R
authors.initials: AR
authors.lastname: Rossi
authors.forename: V
authors.initials: V
authors.lastname: Iaselli
authors.forename: E M
authors.initials: EM
authors.lastname: Rasch
authors.forename: P J
authors.initials: PJ
authors.lastname: Monaco
mesh_terms: D000818:Animals; D014128:Chromomycin A3; D002871:Chromosome Banding; D005260:Female; D005456:Fluorescent Dyes; D006570:Heterochromatin; D007211:Indoles; D008297:Male; D009697:Nucleolus Organizer Region; D011036:Poecilia / Q000235:genetics*; D011796:Quinacrine; D016622:Silver Staining; D013194:Staining and Labeling
chemical_list: D005456:Fluorescent Dyes; D006570:Heterochromatin; D007211:Indoles; C007293:DAPI; D014128:Chromomycin A3; D011796:Quinacrine