due to cereal are affected by drought stress in their lifetime. in order to study gene action of bread wheat under drought stress condition, a generation mean analysis was performed using f1, f2 and f3 generations derived from roushan and kavir. generation mean analysis was performed based on joint scaling test. genetic parameters including additive effect (d), dominance effect (h), additive×ad...

We present a new parameterization of physiological epistasis that allows the measurement of epistasis separate from its effects on the interaction (epistatic) genetic variance component. Epistasis is the deviation of two-locus genotypic values from the sum of the contributing single-locus genotypic values. This parameterization leads to statistical tests for epistasis given estimates of two-loc...

Bayesian approaches have been extensively used in animal breeding sciences, but similar approaches in the context of evolutionary quantitative genetics have been rare. We compared the performance of Bayesian and frequentist approaches in estimation of quantitative genetic parameters (viz. matrices of additive and dominance variances) in datasets typical of evolutionary studies and traits differ...

CONTENTS Animal rearing and sample collection . . . . . . . . . . . . . . . . 1 Measurements of larval morphology . . . . . . . . . . . . . . . . . 2 Analyses of larval morphology . . . . . . . . . . . . . . . . . . 2 Estimates of additive genetic variances and covariances . . . . . . . . . . 3 Bayesian estimates of quantitative genetics parameters . . . . . . . . . . 6 Additive genetic varianc...

In contrast to our growing understanding of patterns of additive genetic variance in single- and multi-trait combinations, the relative contribution of nonadditive genetic variance, particularly dominance variance, to multivariate phenotypes is largely unknown. While mechanisms for the evolution of dominance genetic variance have been, and to some degree remain, subject to debate, the pervasive...

Gray leaf spot (GLS) is a major maize disease in Brazil that significantly affects grain production. We used Bayesian inference to investigate the nature and magnitude of gene effects related to GLS resistance by evaluation of contrasting lines and segregating populations. The experiment was arranged in a randomized block design with three replications and the mean values were analyzed us...

Abstract Additive, dominance and epistasis genetic variances were estimated from analysis of a clonally replicated full-sib progeny test grown in the Republic Congo. Phenotypic variance components for ages 4 through 25 months growth at 8 18 ecophysiological traits. The estimation genetics effects was derived individual mixed model. Genetic structure incorporated into covariance’s based on marke...

melon is an economically important crop and iran is considered as its diversity center. to investigate gene action, heritability and number of effective factors for yield and related traits, six generations, namely: p1, p2, f1, f2, bc1, and bc2 of two crosses of mirpanji × tashkandi and mirpanji × abasali were produced and evaluated in the spring of 2008, applyig a complete block design of thre...