Meiotic Behaviour
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Hybridization among brazilian oat (Avena satia L.) cultivars and the wild oat a. sterilis L.
Hybrids among Avena sativa (L.) Brazilian cultivars and A. sterilis L. accessions were abtained without in vitro embryo culture. Parental samples and their hybrids were investigated by morphological characters of spikelets, meiotic chromosome behaviour and esterase isoenzymes anlaysis. The F hybrids were intermediate to the parental lines for the morphologic
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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2. Meiotic and mitotic behaviour of B chromosomes of ryegrass.
2010
Ciência Rural. Publicado em: 2011
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3. Evolução da diferenciação cromossômica entre os sexos no Gênero Gymnotus (Gymnotiformes, Gymnotidae )
The order Gymnotiformes ranges the electrical fish. Its distributed by South and Central America. Family Gymnotidae show two genus; Gymnotus and Eletrophurus, the last one was recently included in this family. Genus Gymnotus is the most widespread and show 33 species and present great number of cytogenetics studies. Our objectives in the present study were a
Publicado em: 2010
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4. Contribuição a citogenetica de Trypoxylon (Trypargilum) albitarse Fabricius, 1804 (Hymenoptera, Sphecidae) : I. Dinamica dos cromossomos B II. Estudos da NOR e nucleolos
Among the 13 cytogenetica1ly analysed species of Trypoxylon genus, only T. albitarse possess B chromosomes. Two types morphologically distinct of B chromosomes have been found in this wasp, one metacentric and other acrocentric, which are totally heterochromatic. Over the last five years (1996 the 2000), 1003 specimens of T. albitarse obtained from 692 nests
Publicado em: 2002
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5. Meiotic behaviour of two human reciprocal translocations.
The meiotic behaviour of two male human reciprocal translocations is described. One patient had an unbalanced son and a chain configuration. The second had a stillborn child and a ring corresponding to an adjacent I segregation. The meiotic behaviour of chromosomal rearrangements must be investigated for proper genetic counselling.
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6. Multiple Meiotic Drive Systems in the DROSOPHILA MELANOGASTER Male
The behaviour of two "meiotic drive" systems, Segregation-Distorter (SD) and the sex chromosome sc4sc8 has been examined in the same meiocyte. It has been found that the two systems interact in a specific way. When the distorting effects of SD and sc4sc8 are against each other, there is no detectable interaction. Each system is apparently oblivious to the pr
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7. Integration of a B chromosome into the A genome of a wasp.
B chromosomes are genome symbionts, the presence of which in many eukaryote species is explained, in most cases, by their violation of Mendelian rules, usually based on meiotic or mitotic instability, leading to their accumulation in the germ line (drive). However, B chromosome integration into the genome as a regular member of the chromosome set should impl
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8. High-resolution sperm typing of meiotic recombination in the mouse MHC Eβ gene
Meiotic crossovers detected by pedigree analysis in the mouse MHC cluster into hotspots. To explore the properties of hotspots, we subjected the class II Eβ gene to high-resolution sperm crossover analysis. We confirm the presence of a highly localized hotspot 1.0–1.6 kb wide in the second intron of Eβ and show that it is flanked by DNA which is almost
Oxford University Press.
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9. The Meiotic Behavior of an Inversion in Caenorhabditis Elegans
The rearrangement hIn1(I) was isolated as a crossover suppressor for the right end of linkage group (LG) I. By inducing genetic markers on this crossover suppressor and establishing the gene order in the homozygote, hIn1(I) was demonstrated to be the first genetically proven inversion in Caenorhabditis elegans. hIn1(I) extensively suppresses recombination in
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10. The meiosis-specific Xmr gene product is homologous to the lymphocyte Xlr protein and is a component of the XY body.
The Xlr (X-chromosome linked, lymphocyte regulated) multigene family was previously found to determine, in the lymphoid cell lineage, the stage-specific expression of a nuclear protein with a primary sequence suggestive of a transcriptional activator function. We report here the characterization of a second functional member of the Xlr gene family that is ab
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11. Characterization of Schizosaccharomyces pombe minichromosome deletion derivatives and a functional allocation of their centromere.
A 530 kb long Schizosaccharomyces pombe linear minichromosome, Ch16, containing a centric region of chromosome III, has previously been made. In the present study, we constructed a number of deletions in the right and/or left arms of Ch16, and compared their structure and behaviour with Ch16. The functional centromere, cen3, is allocated within a 120 kb long