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| Aguilar Silva,Fernando; Aguilar Silva,Bernardo; García,Mario Augusto. |
| El peso de frutos por planta es una característica compleja y controlada por múltiples genes donde el ambiente interfiere en la manifestación fenotípica. La estimación de componentes génicos como los de interacción epistática es de gran importancia en el proceso de mejoramiento genético de una especie. El objetivo de este estudio fue la estimación de parámetros genéticos para el peso del fruto por planta, usando un análisis de medias generacionales (P1, P2, F1, F2, RC<sub1 y RC2), derivados del cruzamiento entre las líneas endocriadas de pimentón serrano y aji cayenne cultivar 958, Capsicum annuum L. El análisis reveló que los componentes genéticos de aditividad, dominancia y las interacciones epistáticas digénicas fueron significantes en la... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Acción génica; Aditividad; Dominancia; Epistasis; Heredabilidad. |
| Ano: 2013 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122013000100011 |
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| Castañón-Najera,G; Ramírez-Meraz,M; Ruiz-Salazar,R; Mayek-Pérez,N. |
| Las variedades de chile: (1) Mirador, (2) Piquín huasteco, (3) Pico paloma (4) Ozulamero y (5) Chilpaya Tabasco, fueron cruzadas en un dialélico que no incluyó las cruzas recíprocas para producir 10 combinaciones híbridas F1. Mientras las variedades (1), (2) y (4) pertenecen a Capsicum annuum, la (3) y la (5) pertenecen a Capsicum frutescens. Los cuatro marcadores AFLP usados amplificaron 282 bandas o fragmentos, y de éstos 264 fueron polimórficos. Los parámetros genéticos estimados mostraron que existió dominancia en base a las distancias genéticas obtenidas con los fragmentos de ADN. La heredabilidad estimada en sentido estrecho fue moderada (0,53), lo que manifiesta la presencia de efectos dominantes. El análisis de conglomerados con base en distancias... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Análisis molecular; Cruzas dialélicas; Epistasis; Dominancia; Especies de chile. |
| Ano: 2011 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572011000100008 |
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| Plucain, Jessica; Suau, Antonia; Cruveiller, Stephane; Medigue, Claudine; Schneider, Dominique; Le Gac, Mickael. |
| Background The impact of historical contingency, i.e. the past evolutionary history of a population, on further adaptation is mostly unknown at both the phenotypic and genomic levels. We addressed this question using a two-step evolution experiment. First, replicate populations of Escherichia coli were propagated in four different environmental conditions for 1000 generations. Then, all replicate populations were transferred and propagated for further 1000 generations to a single new environment. Results Using this two-step experimental evolution strategy, we investigated, at both the phenotypic and genomic levels, whether and how adaptation in the initial historical environments impacted evolutionary trajectories in a new environment. We showed that... |
| Tipo: Text |
Palavras-chave: Experimental evolution; Escherichia coli; Adaptation; Historical contingency; Epistasis. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00333/44447/44118.pdf |
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| Pettersson,Mats E.; Carlborg,Örjan. |
| Long-term selection experiments provide a valuable resource for understanding the genetic changes that take place in animal improvement programs. The Virginia chicken lines have for more than 50 years been subjected to single-trait, bi-directional, divergent selection for high and low juvenile body weight. It is one of the most well studied experimental populations in agricultural animals and has played an instrumental role in the understanding of the genetic basis of complex traits. In this paper, we summarize the findings from the more recent publications focusing on the efforts to identify the loci contributing to selection response as well as discuss the currently ongoing research. We conclude by describing some future research prospects that promise... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Body weight; Chicken; Epistasis; Metabolic; QTL; Selection. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001300028 |
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| Bocianowski,Jan. |
| Epistasis, an additive-by-additive interaction between quantitative trait loci, has been defined as a deviation from the sum of independent effects of individual genes. Epistasis between QTLs assayed in populations segregating for an entire genome has been found at a frequency close to that expected by chance alone. Recently, epistatic effects have been considered by many researchers as important for complex traits. In order to understand the genetic control of complex traits, it is necessary to clarify additive-by-additive interactions among genes. Herein we compare estimates of a parameter connected with the additive gene action calculated on the basis of two models: a model excluding epistasis and a model with additive-by-additive interaction effects.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Additive gene action effect; Barley; Doubled haploid lines; Epistasis; QTL. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000100013 |
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| Cervantes Santana, Tarsicio; Bucio Alanís, Lauro. |
| En este trabajo se considera que la expresión fenotípica de un carácter en los individuos de una población, se debe a efectos genéticos y a efectos ambientales. En los genéticos se incluyen aditividad (d), dominancia (h) e interacciones entre dos pares de genes alelomórficos (i, j y l) y se toma como origen de medida para d, h, i, j y l, la media de los padres P1 y P2, que es el sistema de medida de Van der Veen (F oo-metric). En la primera parte se trata con las medidas de generaciones y se da el modelo lineal aditivo que incluye las componentes genéticas arriba citadas; en este caso los efectos de cada componente se localizan en diferentes términos de cada ecuación y fácilmente se puede hacer la estimación de los parámetros del modelo. Para tener un... |
| Tipo: Artículo |
Palavras-chave: Genética; Varianza genética; Variación fenotípica; Modelos lineales; Epistasis. |
| Ano: 1969 |
URL: http://hdl.handle.net/10521/1913 |
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| Lau,Cia-Hin; Muniandy,Sekaran. |
| Epistasis (gene-gene interaction) is a ubiquitous component of the genetic architecture of complex traits such as susceptibility to common human diseases. Given the strong negative correlation between circulating adiponectin and resistin levels, the potential intermolecular epistatic interactions between ADIPOQ (SNP+45T > G, SNP+276G > T, SNP+639T > C and SNP+1212A > G) and RETN (SNP-420C > G and SNP+299G > A) gene polymorphisms in the genetic risk underlying type 2 diabetes (T2DM) and metabolic syndrome (MS) were assessed. The potential mutual influence of the ADIPOQ and RETN genes on their adipokine levels was also examined. The rare homozygous genotype (risk alleles) of SNP-420C > G at the RETN locus tended to be co-inherited... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Adipokine; ADIPOQ; Epistasis; Interaction; RETN. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000100005 |
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| Barbosa,Severino B.P.; Ramalho,Ricardo P.; Monardes,Humberto G.; Dias,Flávio M.; Santos,Djalma C. dos; Batista,Ângela M.V.. |
| The productive performance of four Holstein-Gir genetic groups (1/2H, 1/4H, 5/8H, 5/8Hinter se) and the effects of non-genetic factors on production traits was evaluated using a data set of 7,951 test-day samples collected between January 1980 and December 1999 from the Arcoverde Experimental Station in the Brazilian state of Pernambuco (Empresa Pernambucana de Pesquisa Agropecuária). The statistical model included the fixed effects of calving year (1980 to 1999) and month (January to December), genetic group of the cow, age at months of calving (33 to 190) and days in milk at each test-day. Random effects were sire, cow and residual with test-days treated as repeated records within each cow within each lactation. For the four genetic groups the milk yield... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic groups; Epistasis; Genetics groups; Recombination; Repeated measures; Test-day. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000300012 |
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| Lopes,Jader Silva; Rorato,Paulo Roberto Nogara; Weber,Tomás; Araújo,Ronyere Olegário de; Dornelles,Mariana de Almeida; Comin,Juliana Grigolleto. |
| This work aimed at estimating the genetic effects that affect the pre-weaning performance of animals from multibreed crosses. In order to do so, it was used information of the weight at weaning of 79,521 animals, sired by 1,020 bulls and 61,898 cows from Aberdeen Angus and Nellore breeds and from many genetic groups resulted from their crosses. Five genetic models were tested: model 1, containing the fixed breed genetic effects (additive direct and maternal effects, heterozygote direct and maternal effects, epystatic direct and maternal effects, joint additive direct and maternal effects); model 2, equal to model 1, excluding direct and maternal joint additive effects; model 3, equal to model 1, excluding direct and maternal epystatic effects; model 4,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Additive effect; Complementarity among breeds; Epistasis; Heterozygous; Multicollinearity; Weaning weight. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100014 |
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| Hernández-Bautista,Aurelio; Lobato-Ortiz,Ricardo; García-Zavala,José Jesús; López-Fortoso,Fernando; Cruz-Izquierdo,Serafín; Chávez-Servia,José Luis; Cadeza-Espinosa,Marisol. |
| ABSTRACT The flowering time is regarded as an important factor that affects yield in various crops. In order to understand how the molecular basis controlling main components of earliness in tomato (Solanum lycopersicum L.), and to deduce whether the correlation between fruit weight, days to flowering and seed weight, is caused by pleiotropic effects or genetic linkage, a QTLs analysis was carried out using an F2 interspecific population derived from the cross of S. lycopersicum and S. pimpinellifolium. The analysis revealed that most of the components related to earliness were independent due to the absence of phenotypic correlation and lack of co-localization of their QTLs. QTLs affecting the flowering time showed considerable variation over time in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum lycopersicum; QTLs; Epistasis; Days to flowering; Path analysis. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162016000500478 |
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| Kiihl,Tammy Aparecida Manabe; Arias,Carlos Alberto Arrabal. |
| The objective of this work was to evaluate the effect of the transgenic soybean BR-16-AHAS genetic constitution on the tolerance to the herbicide imazapyr. BR-16-AHAS was crossed with ten other genotypes. The experimental design was a complete randomized block, in a 2x12x3 factorial arrangement, with two sowing periods (winter and summer), twelve crossing groups and three plant positions (upper, mid and lower), with three replicates. The plants were treated with 100 g ha-1 a.i. of imazapyr at the V3/V4 stage. For each position of the plant (upper, mid and lower), the following variables were assessed: number of pods, number of seeds, seed weight, number of seeds per pod and the 100 seeds weight. The effect of the herbicide varied according to the more... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Arabidopsis thaliana; Glycine max; Epistasis; Genetic transformation. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000800012 |
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| Bordignon,Rita; Medina-Filho,Herculano Penna; Siqueira,Walter José; Teófilo Sobrinho,Joaquim. |
| Controlled pollinations between four elite citrus rootstocks, Citrus limonia - 'Limeira' rangpur lime (Cravo), C. sunki - 'Sunki' mandarin (Sunki), C. aurantium - 'São Paulo' sour orange (Azeda) and Poncirus trifoliata - 'Davis A' trifoliate orange (Trifoliata), resulted in 1614 nucelar and 1938 hybrid plants identified by the isozyme loci Pgi-1, Pgm-1, Got-1, Got-2, Aps-1, Me-1, Prxa-1 and or by the morphological markers broadness of leaf petiole wing or trifoliolate leaves. Tolerance to the citrus tristeza virus (CTV) was evaluated under nursery and field conditions for several years by the reaction of Valencia orange infected with a severe strain of CTV and grafted onto the hybrids and nucellar clones. Genetic analyses indicated that tolerance was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; CTV; Epistasis; Rootstock; Tristeza. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000200013 |
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| Registros recuperados: 20 | |
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