Epistatic Effects
Mostrando 13-24 de 96 artigos, teses e dissertações.
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13. Alcohol dehydrogenase activities and ethanol tolerance in Anastrepha (Diptera, Tephritidae) fruit-fly species and their hybrids
The ADH (alcohol dehydrogenase) system is one of the earliest known models of molecular evolution, and is still the most studied in Drosophila. Herein, we studied this model in the genus Anastrepha (Diptera, Tephritidae). Due to the remarkable advantages it presents, it is possible to cross species with different Adh genotypes and with different phenotype tr
Genetics and Molecular Biology. Publicado em: 16/01/2009
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14. AvaliaÃÃo de cruzamentos de ovinos das raÃas dorper, poll dorset, santa inÃs e somalis brasileira / Assessment of crosses of sheep breeds dorp, poll dorset, santa inÃs and somalis brazilian
O objetivo deste trabalho foi de analisar as caracterÃsticas de crescimento, reprodutivas e de habilidade materna de vÃrios grupos genÃticos compostos pelas raÃas Santa InÃs, Somalis Brasileira, Dorper, Poll Dorset, e seus cruzamentos, avaliando os diversos fatores genÃticos e nÃo genÃticos envolvidos. Foram utilizados registros de peso ao nascer (PN
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2008
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15. Genetic effects for maize traits in acid and non-acid soils
Breeding programs for acid-soil tolerance are desirable as a relatively inexpensive and permanent way for increasing maize (Zea mays L.) yield on these soils. Our objective was to compare the genetic effects controlling the expression of maize traits in acid and non-acid soils. Seven related and one unrelated inbred lines, with different levels of tolerance
Genetics and Molecular Biology. Publicado em: 2008
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16. Estimative of gene effects for traits related to phosphorus efficiency and responsiveness in tropical maize / Estimativas de efeitos gênicos de diversos caracteres relacionados à eficiência e resposta ao fósforo em milho tropical
Low information is available concerning the inheritance of phosphorus (P) efficiency and responsiveness in tropical maize, obtained from trials conducted until maturity in tropical environments. This information is the basis to establish selection strategies for these characteristics. The objective of this study was to investigate the inheritance and relatio
Publicado em: 2008
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17. Generation mean analysis for quantitative traits in sesame (Sesamum indicum L.) crosses
To study the nature and magnitude of gene effects for yield and its components in sesame (Sesamum indicum L.) we carried out generation mean analysis using the following four crosses of different sesame cultivars: VS 9510 x Co1; NIC 7907 x TMV 3; Cianno 13/10x VRI 1; and Si 1115/1 x TMV 3. The P1, P2, F1, F2, BC1 and BC2 of these generations were studied for
Genetics and Molecular Biology. Publicado em: 2007
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18. Use of ridge regression for the prediction of early growth performance in crossbred calves
The problem of multicollinearity in regression analysis was studied. Ridge regression (RR) techniques were used to estimate parameters affecting the performance of crossbred calves raised in tropical and subtropical regions by a model including additive, dominance, joint additive or "profit heterosis" and epistatic effects and their interactions with latitud
Genetics and Molecular Biology. Publicado em: 2007
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19. Inheritance of rice cold tolerance at the germination stage
Cold tolerance during germination is important for ensuring fast and uniform establishment of a rice crop early in the season. However, evaluation of this trait under field conditions is limited by environmental variation, which makes it difficult to identify genetically superior lines. Evaluation of cold tolerance under controlled temperature conditions may
Genetics and Molecular Biology. Publicado em: 2006
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20. Genetic basis of quantitative traits in different oat (Avena sativa L.) populations / Bases genéticas de caracteres quantitativos em diferentes populações de aveia (Avena sativa L.)
In the investigations performed with the oat crop, many mechanisms have been proposed with the goal of maximizing the genetic gains in different quantitative traits, especially on segregating populations, where a greater level of genetic interaction is expected. On the other hand, great value has been attributed to the right choice of environmentally adapted
Publicado em: 2006
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21. Quantitative inheritance of some wheat plant traits
The objective of this study was to estimate gene effects and genetic variability for some quantitative traits of two winter wheat crosses (Soissons/Zitarka and Soissons/Sana) by generation mean analysis. In most cases a digenic epistatic model was sufficient to explain variation in generation means. The additive-dominance model was adequate for plant height
Genetics and Molecular Biology. Publicado em: 2004
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22. Multivariate analysis of combining ability for soybean resistance to Cercospora sojina Hara
Seven soybean cultivars (Bossier, Cristalina, Davis, Kent, Lincoln, Paraná and Uberaba), with different levels of resistance to Cercospora sojina, race 04, were crossed according to a diallel design, with no reciprocals, to determine the general and the specific combining abilities for the resistance. The evaluations of the reaction to the disease were perf
Genetics and Molecular Biology. Publicado em: 2004
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23. Patossistema milho X Colletotrichum graminicola: estudo de herança, mapeamento de genes de resistência e estimativas de danos na produção. / Maize X Colletotrichum graminicola pathosystem: study on inheritance, resistance gene mapping and yield reduction estimates.
The incidence of Colletotrichum graminicola (Ces.) Wils as the causal agent of stalk rot has increased significantly in recent years in Brazil due to an increase in the area cultivated with maize, in addition to implemented changes in cultural practices. The objectives of this work were to determine the mode of inheritance of resistance to stalk anthracnose,
Publicado em: 2004
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24. Epistasis in Measured Genotypes: Drosophila P-Element Insertions
Transposon tagging provides an opportunity to construct large numbers of strains of organisms that differ by single insertional mutations. By scoring the phenotypes of these ``measured genotypes,'' powerful tests of effects of mutations on phenotypic expression have been performed. Here we extend this approach by constructing with simple crosses all possible