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Plant Genetics   Research Article

Chromosome variations and diversity of Epidendrum ibaguense Lindl. (Orchidaceae) on the Tepequém’s Tepuy, Roraima, Brazil

Authors: S.R. Nóbrega, A.L.F. Coelho, C.F. Verola, I.R. Costa, R. Vilaça, F.J.F. Luz and W.F. Araújo

Studies addressing chromosome variations have elucidated many points regarding the taxonomy of the Orchidaceae. Epidendrum L. besides being one the largest orchid genera, present remarkable morphological, and inter- and intraspecific chromosome variations. Thus, based on a previous report on flower color variation in individua.. Read More»

Genet. Mol. Res. 16(3):
Human Genetics   Research Article

Sex chromosome differentiation in Belostoma (Insecta: Heteroptera: Belostomatidae)

Authors: V.B. Bardella, A.L. Dias, L. Giuliano-Caetano, J.R.I. Ribeiro and R. Da Rosa

Belostoma, a genus of the family Belostomatidae, includes species of great ecological importance as biocontrol agents. Few species of these species have been the subject of cytogenetic analyses. Karyotypic evolution in this genus involves agmatoploidy and simploidy; there are also different sex chromosome systems. We examined two Belostoma species (B. dil.. Read More»

Genet. Mol. Res. 11(3):
Human Genetics   Research Article

FISH analysis and cytogenetic characterization of male meiotic prophase I in Acricotopus lucidus (Diptera, Chironomidae)

Authors: W. Staiber

In the chironomid Acricotopus lucidus, two cells with quite different chromosome complements arise from the last unequal spermatogonial mitosis, as a consequence of monopolar migration of the so-called germ line limited chromosomes (Ks). The cell receiving all the Ks, in addition to two sets of the regularly segregating somati.. Read More»

Genet. Mol. Res. 8(4):
Plant Genetics   Research Article

Cytogenetic characterization of Rhamdia quelen (Siluriformes, Heptapteridae) from the Bodoquena Plateau, Mato Grosso do Sul, Brazil

Authors: V.P.O. Moraes, S.S. Cereali, O. Froehlich, A.L. Dias

We made a cytogenetic study of the fish Rhamdia quelen collected from the Bodoquena Plateau, an isolated national park region in Mato Grosso do Sul State, Brazil. The diploid number was 2n = 58, with 36 metacentric + 16 submetacentric + 6 subtelocentric chromosomes. We found one to three B chromosomes, which were metacentric a.. Read More»

Genet. Mol. Res. 6(3):
Animal Genetics   Research Article

Differential characterization of holocentric chromosomes in triatomines (Heteroptera, Triatominae) using different staining techniques and fluorescent in situ hybridization

Authors: A. Morielle-Souza, M.T.V. Azeredo-Oliveira

A comparative study of holocentric chromosomes in the triatomine species Panstrongylus megistus, Rhodnius pallescens and Triatoma infestans was carried out in order to characterize heterochromatin, rDNA active sites and nucleolar proteins. Cytological preparations of seminiferous tubules were stained by silver impregnation, C .. Read More»

Genet. Mol. Res. 6(3):
Animal Genetics   Research Article

Differentiation and evolutionary relationships in Erythrinus erythrinus (Characiformes, Erythrinidae): occurrence and distribution of B chromosomes

Authors: N.F. Martins, M.B. Cioffi, W.P. Troy, J.F. Martinez, O. Moreira-Filho and L.A.C. Bertollo

Erythrinus erythrinus, a Neotropical fish species of the Erythrinidae family, has a wide distribution in South America. Previous cytogenetic analysis showed that this species presents extensive karyotype diversity, with 4 karyomorphs (A-D) described herein. This study investigated the karyotypic structure of 2 new pop.. Read More»

Genet. Mol. Res. 13(3):
Microbial Genetics   Research Article

Karyotype and spermatogenesis in Triatoma lenti (Hemiptera: Triatominae), a potential Chagas vector

Authors: K.C.C. Alevi P.P. Mendonça M. Succi N.P. Pereira J.A. Rosa M.T.V. Azeredo-Oliveira

All species of Triatominae are susceptible to infection by Trypanosoma cruzi (Kinetoplastida: Trypanosomatidae) and consequently, potential insect vectors of Chagas disease. Currently, there are 140 known species of triatomine bugs, which can be grouped into specific species complexes. The species Triatoma lenti (Hemiptera: Triatominae) is found only in B.. Read More»

Genet. Mol. Res. 11(4):
Animal Genetics   Research Article

Molecular sexing of unusually large numbers of Spheniscus magellanicus (Spheniscidae) washed ashore along the Brazilian coast in 2008

Authors: E.C. Reis, R.M. Aires, J.F. Moura, C.A.R. Matias, M. Tavares, P.H. Ott, S. Siciliano and G. Lôbo-Hajdu

There have been few studies on Magellanic penguins (Spheniscus magellanicus). In 2008, these penguins washed ashore along the Brazilian coast in unusually high numbers, some reaching as far as northeast Brazil. As Magellanic penguins show little sexual dimorphism, sex determination by morphological features is not accurate. He.. Read More»

Genet. Mol. Res. 10(4):
Plant Genetics   Research Article

Spermatogenesis and karyotypes of three species of water striders (Gerridae, Heteroptera)

Authors: M.M.U. Castanhole, L.L.V. Pereira, H.V. Souza and M.M. Itoyama

Although they are of economic importance, there have been few cytogenetic studies of the Gerridae (Heteroptera) in Brazil. We examined spermatogenesis (meiosis and spermiogenesis) and nucleolar behavior in three species of the family Gerridae. Brachymetra albinerva and Halobatopsis platensis were found to have a chromosome com.. Read More»

Genet. Mol. Res. 9(3):
Animal Genetics   Research Article

Homology of polytene elements between Drosophila and Zaprionus determined by in situ hybridization in Zaprionus indianus

Authors: Campos SRC, Rieger TT and Santos JF

The drosophilid Zaprionus indianus due to its economical importance as an insect pest in Brazil deserves more investigation into its genetics. Its mitotic karyotype and a line-drawing map of its polytene chromosomes are already available. This paper presents a photomap of Z. indianus polytene chromosomes, which was used as the.. Read More»

Genet. Mol. Res. 6(2):


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