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Research on Synthesis Selection Index for Quantitative Characters of Major-polygene and Polygene

Author: ChenXiaoLei
Tutor: GuoManCai；YuanZhiFa
School: Northwest University of Science and Technology
Course: Applied Mathematics
Keywords: Quantitative traits Major Gene - multigene mixed EM algorithm Parameter Estimation AIC criterion Comprehensive Selection Index
CLC: Q75
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


Classic quantitative genetics , the comprehensive selection index based polygene genetic system to analyze . Modern quantitative genetics has minor polygenic system development based gene - polygenic system . Thus major genes - polygenic traits and trait polygenes mixed comprehensive selection index to conduct research into , is imperative in order to move - the choice of plant breeding have better guidance and reference. Polygene quantitative trait phenotypes follow a normal distribution , but the major gene - polygenic trait appears as skewed or multimodal . So you need to major genes - polygenic traits mixed normal distribution separation and analysis . This study used mixed normal distribution of the EM algorithm , by means of the experimental results are not segregating generations were estimated phenotypic variance for each trait , the main genetic variance , polygenic variance and environmental variance and other parameters , and in the classic comprehensive selection index based on the theory gives further major gene - polygenic traits and traits polygene comprehensive selection index model, and to the main gene QTL mapping information . The specific methods are as follows : First , the use of non- segregating generations of data to estimate environmental variance ; Second , the use of various traits identified to determine the frequency distribution of the traits belonging to the main gene - polygenic trait or traits polygene . If polygene press classic quantitative genetic trait system method to estimate the parameters ; if the trait -based gene - polygenic trait , the separation and analysis of the use of mixed normal distribution methods, estimates the number of each component distribution characteristics and related the genetic variance ; Third, in the above two points , based on the establishment of major gene - polygenic traits and trait polygene mathematical model of comprehensive selection index , while genes determine the main contribution of genetic variance . If a large proportion of the major genes , it would take major gene QTL mapping , by controlling the main locus to control phenotypic traits to improve selection efficiency. In addition , this study a major gene - polygenic trait with a polygenic trait mixed minor example to study , this method can be extended multiple master genes - polygenic traits and multiple minor genes mixed case characters .

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