Comparative cytogenetics of three species of Dichotomius (Coleoptera, Scarabaeidae)
Genet. mol. biol
;
32(2): 276-280, 2009. ilus
Article
in English
| LILACS
| ID: lil-513958
ABSTRACT
Meiotic and mitotic chromosomes of Dichotomius nisus, D. semisquamosus and D. sericeus were analyzed after conventional staining, C-banding and silver nitrate staining. In addition, Dichotomius nisus and D. semisquamosus chromosomes were also analyzed after fluorescent in situ hybridization (FISH) with an rDNA probe. The species analyzed had an asymmetrical karyotype with 2n = 18 and meta-submetacentric chromosomes. The sex determination mechanism was of the Xy p type in D. nisus and D. semisquamosus and of the Xyr type in D. sericeus. C-banding revealed the presence of pericentromeric blocks of constitutive heterochromatin (CH) in all the chromosomes of the three species. After silver staining, the nucleolar organizer regions (NORs) were located in autosomes of D. semisquamosus and D. sericeus and in the sexual bivalent of D. nisus. FISH with an rDNA probe confirmed NORs location in D. semisquamosus and in D. nisus. Our results suggest that chromosome inversions and fusions occurred during the evolution of the group.
Full text:
Available
Index:
LILACS (Americas)
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2009
Type:
Article
/
Project document
Affiliation country:
Brazil
Institution/Affiliation country:
Universidade Federal de Pernambuco/BR
/
Universidade de Pernambuco/BR
/
Universidade de São Paulo/BR
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