Diploid Males
Mostrando 13-24 de 53 artigos, teses e dissertações.
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13. Estudos de citogenética e de filogenia molecular em roedores da tribo Akodontini / Cytogenetics and molecular phylogenetics in rodents of the tribe Akodontini
Traditionally comparative cytogenetic studies are based mainly on banding patterns. Nevertheless, when dealing with species with highly rearranged genomes, as in Akodon species, or with other highly divergent species, cytogenetic comparisons of banding patterns prove to be inadequate. Hence, comparative chromosome painting has become the method of choice for
Publicado em: 2009
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14. Chromosome evolution: Karyotype variability in Platyrrhini and studies of sinteny and homologies between human chromosomes / Evolução cromossômica: estudo da variabilidade cariotípica em Platyrrhini e das homeologias e sintenias com cromossomos humanos
We studied the karyotypes of Brazilian monkeys (Platyrrhini, Primates) using both traditional cytogenetic techniques as well as FISH. FISH analysis employed human probes for chromosome 14, 15 and the X chromosome and a probe of the Y chromosome of Brachyteles arachnoides obtained by chromosome microdissection. Twenty-four individuals of Alouatta guariba clam
Publicado em: 2008
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15. Comparative cytogenetics of Carnegiella marthae and Carnegiella strigata (Characiformes, Gasteropelecidae) and description of a ZZ/ZW sex chromosome system
Comparative cytogenetic analyses of hatchetfishes Carnegiella marthae and Carnegiella strigata (Gasteropelecidae) from the Rio Negro basin were performed using conventional Giemsa staining, silver (Ag) -staining and C-banding. The diploid chromosome numbers of both species equaled 2n = 50 but their karyotypes were distinct. We found evidence for sex chromoso
Genetics and Molecular Biology. Publicado em: 2008
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16. Estrutura genética e sociogenética das populações e ninhos de Euglossini (Hymenoptera: Apidae) determinadas por meio de microssatélites.
Euglossine bees are important pollinators of many Neotropical plant species, particularly orchids which could present a species-specific bee-flower relationship, essential to the reproductive success of these plants. Orchids produce chemical compounds to attract males of Euglossine bees (the effective pollinators of the orchids), and these compounds were iso
Publicado em: 2007
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17. Chromosome study in Schistocerca (Orthoptera-Acrididae-Cyrtacanthacridinae): karyotypes and distribution patterns of constitutive heterochromatin and nucleolus organizer regions (NORs)
Chromosome analyses were performed in two grasshopper species of the genus Schistocerca, S. pallens and S. flavofasciata. Both species shared the same diploid number (2n = 23, X in males; 2n = 24, XX in females);and a conserved karyotype composed exclusively of acrocentric chromosomes, but differed in their distribution patterns of constitutive heterochromat
Genetics and Molecular Biology. Publicado em: 2007
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18. Origem e diferenciação do sistema de cromossomos sexuais ZZ/ZW em Triportheus (Characiformes, Characidae): citogenética, mapeamento dos genes ribossomais e microdissecção cromossômica
Chromosomes of distinct species of Triportheus (Characiformes, Characidae) from different hydrographic basins in Brazil, as well as in Argentina, were analyzed in the present work. Triportheus nematurus, from Piracicaba River (São Paulo State, Brazil), was analyzed for the first time, using conventional cytogenetic techniques, base-specific fluorochromes an
Publicado em: 2007
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19. Chromosomal banding patterns in the eyelid-less microteiid lizard radiation: The X1X1X2X2:X1X2Y sex chromosome system in Calyptommatus and the karyotypes of Psilophthalmus and Tretioscincus (Squamata, Gymnophthalmidae)
Cytogenetic studies were performed on five closely related microteiid lizards (Gymnophthalmini), three Calyptommatus species and Psilophthalmus paeminosus from the sand dunes of the middle São Francisco river in the semiarid caatinga of the Brazilian state of Bahia and Tretioscincus oriximinensis from the Brazilian Amazon region. The diploid chromosome numb
Genetics and Molecular Biology. Publicado em: 2005-12
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20. Molecular markers in Chinese carps and their interspecific hybrids
A sample consisting of 2 Ctenopharyngodon idella (grass carp) females, 2 Aristichthys nobilis (bighead carp) males, and 10 interspecific hybrids was analyzed using a multidisciplinary approach. The 10 hybrids were the only surviving specimens of a crossbreeding experiment. The cytological approach, involving the measurement of the largest axis of the erythro
Genetics and Molecular Biology. Publicado em: 2005-03
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21. Inbreeding and building up small populations of stingless bees (Hymenoptera, Apidae)
A study of the viability of small populations of Hymenoptera is a matter of importance to gain a better zoological, ethological, genetical and ecological knowledge of these insects, and for conservation purposes, mainly because of the consequences to the survival of colonies of many species of bees, wasps, and ants. Based on the Whiting (1943) principle, Ker
Revista Brasileira de Zoologia. Publicado em: 2002-12
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22. Description of a ZZ/ZW sex chromosome system in Thoracocharax cf. stellatus (Teleostei, Characiformes, Gasteropelecidae)
The family Gasteropelecidae is composed of three genera and eight species. This study shows that Thoracocharax cf. stellatus has 2n = 52 chromosomes for both sexes. The five males studied showed 8 metacentric, 16 submetacentric, 4 subtelocentric, and 24 acrocentric chromosomes; the seven females showed only one submetacentric chromosome, belonging to pair 11
Genetics and Molecular Biology. Publicado em: 2002
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23. Número de alelos XO em uma população de Melipona quadrifasciata anthidioides Lepeletier (Hymenoptera, Apidae, Meliponinae)
The number of xo alleles of a population of stingless bees can be estimated by observing the male proportion of the first brood comb produced by a new queen (about 40 Fl bees) and the total number of colonies. A proportion of 50% diploid males indicates insemination of the queen by a single male with some xo sex allele: 25% diploid male would indicate insemi
Revista Brasileira de Zoologia. Publicado em: 2001-12
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24. Estudo citogenetico comparativo de Edalorhina perezi e Physalaemus petersi (Amphibia, Anura, Leptodactylidae)
Sixty one specimens of Physalaemus petersi and seven of Edalorhina perezi (Leptodactylidae, Anura) from Acre State, Brazil, were studied, to contribute to phylogenetic relationship studies between these two neotropical genera. Chromosome preparations were obtained from cellular suspensions of testis and intestinal epithelium. These cytological preparations w
Publicado em: 1996