Consulta: subjectFacets:"Segregation distortion"
Registros recuperados: 4
Data/hora: 06/06/2024 01:13:59

Skewed RAPD markers in linkage maps of Citrus
Provedor de dados: Genetics and Molecular Biology
Autores: Oliveira,Roberto Pedroso de; Aguilar-Vildoso,Carlos Ivan; Cristofani,Mariângela; Machado,Marcos Antônio.
The objective of this work was to analyze the effects of RAPD markers with skewed segregation on genetic linkage maps. Segregation data for 123 Citrus sinensis (L.) Osbeck cv. Pêra markers and 53 C. reticulata Blanco cv. Cravo markers in F1 progeny composed of 94 hybrids were used. Genetic linkage maps of the two varieties were constructed with non-skewed markers (p &lt; 0.05 and p &lt; 0.01) using the program MAPMAKER 3.0 and a pseudo-testcross strategy. The maps were compared to those constructed with all markers. Alterations in the genetic distances were observed based on the location of the skewed markers within the linkage groups. Generally, the skewed markers were located at the end of the linkage groups, sometimes forming entire linkage groups,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genetic distance; Mendelian segregation; Molecular markers; Segregation distortion.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300021

The SCA1 (Spinocerebellar ataxia type 1) and MJD (Machado-Joseph disease) CAG repeats in normal individuals: segregation analysis and allele frequencies
Provedor de dados: Genetics and Molecular Biology
Autores: Wiezel,Cláudia Emília Vieira; Canas,Maria do Carmo Tomitão; Simões,Aguinaldo Luiz.
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 of the CAG repeat was studied in normal mother-father-child trios, referred for paternity testing (SCA1, n = 367; MJD, n = 879). No segregation distortion was detected. The CAG allele frequencies were determined in 330 unrelated individuals (fathers from couples tested for paternity). The allele frequency distributions did not differ from those previously reported for European populations. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Segregation distortion; Spinocerebellar ataxia type 1; Machado-Joseph disease.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000200002

Detection and mapping of a lethal locus in a eucalyptus hybrid population
Provedor de dados: Pesquisa Agropecuária Brasileira
Autores: Rosado,Tatiana Barbosa; Tomaz,Rafael Simões; Rocha,Rodrigo Barros; Rosado,Antônio Marcos; Alves,Alexandre Alonso; Araújo,Elza Fernandes de; Alfenas,Acelino Couto; Cruz,Cosme Damião.
The objective of this work was to verify the existence of a lethal locus in a eucalyptus hybrid population, and to quantify the segregation distortion in the linkage group 3 of the Eucalyptus genome. A E. grandis x E. urophylla hybrid population, which segregates for rust resistance, was genotyped with 19 microsatellite markers belonging to linkage group 3 of the Eucalyptus genome. To quantify the segregation distortion, maximum likelihood (ML) models, specific to outbreeding populations, were used. These models consider the observed marker genotypes and the lethal locus viability as parameters. The ML solutions were obtained using the expectation‑maximization algorithm. A lethal locus in the linkage group 3 was verified and mapped, with high confidence,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus; Gametic selection; Genetic mapping; QTL; Rust resistance; Segregation distortion.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000900008

Identification of QTL underlying agronomic, morphological and physiological traits in barley under rainfed conditions using SNP markers
Provedor de dados: Acta Scientiarum: Agronomy
Autores: Arriagada, Osvin; Mora, Freddy; Quitral, Yerko; Del Pozo, Alejandro.
Barley (Hordeum vulgare L.) is considered a good genetic model for evaluating mechanisms of drought tolerance, and it is the most important threat to crop production worldwide. This study aimed to identify single-nucleotide polymorphisms (SNPs) associated with agronomic, morphological and physiological traits in a population of 137 recombinant chromosome substitution lines (RCSL) of barley, which were evaluated under rainfed conditions, in Cauquenes, southern Chile (35°58’ S, 72°17’ W). The annual precipitation was 299 mm during the growing season. Fifty-two significant QTLs were detected for the studied traits, which explained between 5% and 13.8% of the phenotypic variation. A genomic region on chromosome 1H (that comprises SNPs 2711-234 and 1923-265)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hordeum vulgare; Mixed model; Recombinant chromosome substitution lines; Segregation distortion.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/32612