Heteromorphism
Mostrando 13-24 de 27 artigos, teses e dissertações.
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13. Cytogenetics of populations and species of Physalaemus cuvieri group (Anura, Leiuperidae) / Citogenetica de populações e especies de Physalaemus do grupo "cuvieri" (Anura, Leiuperidae)
The genus Physalaemus is composed by 41 species distributed in seven groups: albifrons, cuvieri, deimaticus, gracilis, henselii, olfersii and signifer. Nine species compose the group cuvieri but just P. cuvieri had already been karyotyped in details. Expressive intra and interpopulational variation related to the localization
Publicado em: 2007
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14. Análise citogenética comparativa de diferentes populações de Rhamdia quelen (Siluriformes, Heptapteridae)
This study presents cytogenetic findings in 29 specimens of Rhamdia quelen from five different localities: Água dos Patos river, Iepê/SP, Água das Pedras river, Londrina/PR, Taquari river, Jataizinho/PR, Plateau of Bodoquena/MS and a fish culture located in Timbó/SC. All the individuals presented 2n = 58, caryotype formulae of 36m + 16sm + 6st and FN = 1
Publicado em: 2007
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15. Citogenética molecular comparativa do DNAr 18S e 5S em piranhas (Serrasalminae, Characidae) Amazônia Central
Basic and molecular cytogenetic studies have been performed in 11 species of the subfamily Serrasalminae: Colossoma macropomum, Serrasalmus (S. altispinnis, S. elongatus, S. gouldingi, S. rhombeus, S. cf rhombeus, S. serrulatus and S. maculatus), Pygocentrus nattereri, Pristobrycon striolatus and Catoprion mento, collected along different sites in Central Am
Publicado em: 2007
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16. Heterochromatin diversity and its co-localization with 5S and 45S rDNA sites in chromosomes of four Maxillaria species (Orchidaceae)
We investigated four orchids of the genus Maxillaria (M. discolor, M. acicularis, M. notylioglossa and M. desvauxiana) in regard to the position of heterochromatin blocks as revealed using chromomycin A3 (CMA) and 4'-6-diamidino-2-phenylindole (DAPI) fluorochrome staining and 5S and 45S rDNA sites using fluorescence in situ hybridization (FISH). The species
Genetics and Molecular Biology. Publicado em: 2006
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17. Citogenetica comparativa de especies de aplastodiscus e do grupo de Hyla albomarginata (Hylidae, Anura) / Comparative cytogenetics of aplastodiscus species and Hyla albomarginata group (Hylidae, Anura)
The Hylidae family includes four subfamilies, with Hylinae comprising 27 genera. The Hyla genus has many species divided into related groups. The Hyla albomarginata group, as known as "green Hylas" is subdivided into 3 complexes: "albomarginata","albosignata" and "albofrenata". The Aplastodiscus genus has been the object oftaxonomic discussion since its desc
Publicado em: 2005
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18. Chromosomal characterization of Pseudonannolene strinatii (Spirostreptida, Pseudonannolenidae)
The chromosomes of the cave millipede Pseudonannolene strinatii Mauriès, 1974 were investigated. The diploid chromosome number was found to be 2n=16, XX/XY; the C-banding technique revealed a large amount of heterochromatin while the silver staining technique (Ag-NOR) evidenced the presence of heteromorphism of the NORs in some cells.
Iheringia. Série Zoologia. Publicado em: 2004-03
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19. Analises citogeneticas em abelhas do genero Melipona (Hymenoptera, Meliponinae)
This work is a contribution to the studies of the cytogenetics of the genus Melipona (Hymenoptera, Meliponini), which were initiated by KERR in 1948. The chromosome number is the same (n=9 e 2n=18) for the 11 species of the genus: Me/ipona marginata, Me/ipona quadrifasciata, Me/ipona bic%r, Melipona compressipes, Me/ipona subnitida, Me/ipona scutellaris, Mel
Publicado em: 2002
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20. A new centromeric heteromorphism in the short arm of chromosome 20.
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21. Heteromorphism for Heterokaryon Incompatibility Genes in Natural Populations of NEUROSPORA CRASSA
Five Neurospora crassa isolates from each of three sites in Louisiana were compared for genotype at five heterokaryon incompatibility (het) loci. The comparisons were made using duplications (partial diploids), based on the fact that duplications heterozygous for het loci have strikingly abnormal phenotypes which greatly facilitate the study of such genes. D
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22. Origin of the additional chromosome in Down's syndrome: a study of 20 families.
In 20 families with a Down's syndrome child, heteromorphism of chromosome 21 was sought in the parents and proband. Information on the meiotic division and the parent of origin was given in 16 families, the majority of errors being maternal in origin, predominantly at meiosis I, though the paternal contribution is also appreciable. Probabilities of parental
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23. A rare heteromorphism of chromosome 20 and reproductive loss.
A rare centromeric heterochromatic variant of chromosome 20 was encountered during investigations in a couple with repeated miscarriages. The enlarged segment was G and C band positive and stained positively by Giemsa II. In situ hybridisation of the biotinylated alphoid probe D20Z1 specific for the centromere of chromosome 20 to metaphase cells confirmed th
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24. Duplication/deletion polymorphism 5' - to the human beta globin gene.
DNA sequence analysis of the human beta globin locus has identified an array of simple tandem repeated sequences upstream from the beta globin structural gene. Comparison of several cloned human beta globin alleles demonstrated a high frequency of sequence heteromorphism at this site apparently due to duplication or deletion of single units of the repeat arr