Segregation Distortion
Mostrando 1-12 de 76 artigos, teses e dissertações.
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1. Desvio de segregação em humanos / Segregation distortion in humans
The transmission ratio distortion (TRD), a biological process defined as a deviation from Mendelian predictions, is caused by different mechanisms: nonrandom segregation of chromosomes during meiosis or gametic and postzygotic viability selection. In order to investigate TRD in humans, we have studied a family with an overtransmitted pathogenic deletion in t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/03/2011
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2. Genetic linkage maps of 'Pêra' sweet orange and 'Cravo' mandarin with RAPD markers.
The objective of this work was to construct linkage maps of 'Pêra' sweet orange [Citrus sinensis (L.) Osbeck] and 'Cravo' mandarin (Citrus reticulata Blanco) using RAPD markers and the pseudo-testcross strategy. The parents were chosen according to the resistance/susceptibility to citrus variegate chlorosis (CVC). The segregation of 176 markers was analyzed
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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3. Mapping of quantitative trait loci for thermosensitive genic male sterility in indica rice.
The objective of this work was to select and use microsatellite markers, to map genomic regions associated with the genetic control of thermosensitive genic male sterility (TGMS) in rice. An F2 population, derived from the cross between fertile and TGMS indica lines, was used to construct a microsatellite-based genetic map of rice. The TGMS phenotype showed
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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4. Chromosomal localization and molecular marker development of the lipopolysaccharide and beta-1,3-glucan binding protein gene in the Zhikong scallop Chlamys farreri (Jones et Preston) (Pectinoida, Pectinidae)
Zhikong scallop Chlamys farreri (Jones et Preston) is an economically important species in China. Understanding its immune system would be of great help in controlling diseases. In the present study, an important immunity-related gene, the Lipopolysaccharide and Beta-1,3-glucan Binding Protein (LGBP) gene, was located on C. farreri chromosomes by mapping sev
Genetics and Molecular Biology. Publicado em: 26/02/2010
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5. Mapeamento de gene letal, responsável pela distorção de segregação e detecção de QTL para resistência à ferrugem (Puccinia psidii) em Eucalyptus spp / Lethal gene mapping responsible for the segregation distortion and QTL detection for rust (Puccinia psidii) in Eucalyptus spp.
A ferrugem causada por Puccinia psidii é uma doença limitante para a cultura do eucalipto no Brasil. Dessa forma, estudos de herança da resistência à ferrugem, subsidiado por análise de mapeamento e detecção de QTL (s), torna-se de suma importância para auxiliar nos programas de melhoramento. No entanto, em Eucalyptus, principalmente em cruzamentos
Publicado em: 2007
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6. Genetic mapping by molecular markers with gametic and genotypic segregation distortion / Mapeamento genético utilizando marcadores moleculares com distorção de segregação gamética e genotípica
The development of the genetic maps based on DNA markers has been providing remarkable progresses to the genomics of plants and animals. The construction of a genetic map is performed, by using data from the segregant populations, that usually are backcrossing, F2 generation, RILs, double-haploids and others. A mendelian segregation pattern that is typical t
Publicado em: 2006
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7. The SCA1 (Spinocerebellar ataxia type 1) and MJD (Machado-Joseph disease) CAG repeats in normal individuals: segregation analysis and allele frequencies
Spinocerebellar ataxia type 1 (SCA1) and Machado-Joseph disease (MJD/SCA3) are autosomal dominant neurodegenerative diseases caused by expansions of a CAG trinucleotide repeat in the SCA1 and MJD genes. These expanded sequences are unstable upon transmission, leading to an intergeneration increase in the number of repeats (dynamic mutation). The transmission
Genetics and Molecular Biology. Publicado em: 2003
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8. Genetic Dissection of Segregation Distortion II. Mechanism of Suppression of Distortion by Certain Inversions
In(2L+2R)Cy and In(2LR)Pm2 are inversion-bearing chromosomes, the former carrying a paracentric inversion in each arm and the latter carrying a long pericentric. Both chromosomes produce normal segregation ratios when present in heterozygous males with certain segregation distorter chromosomes. The apparent suppression of distortion by these chromosomes was
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9. Sex-ratio segregation distortion associated with reproductive isolation in Drosophila
Sex-ratio distortion is the most common form of non-Mendelian segregation observed in natural populations. It may occur even more frequently than direct observations suggest, because the dysgenic population consequences of a biased sex ratio are expected to result in the rapid evolution of suppressors, resulting in suppressed or “cryptic” segregation dis
The National Academy of Sciences.
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10. Segregation distortion induced by wild-type RanGAP in Drosophila
Segregation Distorter (SD) is a meiotic drive system in Drosophila that causes preferential transmission of the SD chromosome from SD/SD+ males owing to the induced dysfunction of SD+ spermatids. The key distorter locus, Sd, is a dominant neomorphic allele encoding a truncated, but enzymatically active, RanGAP (RanGTPase-activating protein) whose nuclear mis
The National Academy of Sciences.
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11. Temperature Sensitivity of Negative Segregation Distortion in Drosophila Melanogaster
Previous work has shown that the direction of segregation distortion in the SD (Segregation Distorter) system in Drosophila melanogaster can sometimes be reversed, but this was found only with rather weak distorters and the effect was not large. The present study reports large negative segregation distortion in a strong distorter, SD-72 chromosome. In the pr
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12. Genetic Dissection of Segregation Distortion. III. Unequal Recovery of Reciprocal Recombinants
The genetic structure of a segregation distorter chromosome (a derivative of SD-36) has been analyzed in a system in which recombination in the second chromosome is blocked by inversions except for the critical region around the centromeric heterochromatin. The results confirm the map order and characteristics of four loci known to be involved in segregation