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.
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.
Sola
L
L
Dipartimento di Biologia Animale e dell'Uomo, Università di Roma La Sapienza, Italy.
Rossi
A R
AR
Iaselli
V
V
Rasch
E M
EM
Monaco
P J
PJ
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
D005456:Fluorescent Dyes; D006570:Heterochromatin; D007211:Indoles; C007293:DAPI; D014128:Chromomycin A3; D011796:Quinacrine