RESUMO
The karyotype of Chelonus insularis (Hymenoptera, Braconidae, Cheloninae) is described. The males show an haploid number of seven chromosomes and the females a diploid number of fourteen chromosomes, confirming haplo-diploid sex determination. Comparisons of these results with karyotypes of other species of the same family were done and a possible mechanism involved in the karyotype evolution of this species is discussed.
Assuntos
Himenópteros/genética , Animais , Análise Citogenética , Feminino , Cariotipagem , Lepidópteros/parasitologia , MasculinoRESUMO
Eriopis connexa presents a chromosome number of 2n = 18 + XX for most females analyzed and a meioformula of n = 9 + Xyp for all males. A small metacentric B chromosome restricted to females occurred in 10% of our sample and, when submitted to C-banding, it was shown to be almost completely euchromatic. Chromosome pairs 2 and 3 had satellites and probably contained the nucleolar organizer regions (NORs). C-band analysis also revealed that the constitutive heterochromatin was localized in the centromeres of all chromosomes in the complement.
Assuntos
Bandeamento Cromossômico , Besouros/genética , Meiose/genética , Mitose/genética , Animais , Cromatina/genética , Cromossomos , DNA Satélite , Eucromatina , Feminino , Heterocromatina/genética , Cariotipagem , Masculino , Região Organizadora do Nucléolo/genética , Cromossomos Sexuais/genéticaRESUMO
The karyotype of Chelomus insularis (Hymenoptera, Braconidae, Cheloninae) is described. The males show an haploid number of fourteen chromosomes, confirming haplo-diploid sex determination. Comparisons of these results with karyotypes of other species of the same family were done and a possible mechanism involved in the karyotype evolution of this species is discussed.
