phenotypic variance


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Related to phenotypic variance: environmental variance, phenotypic variation

phenotypic variance

the amount of variation in a phenotypic trait amongst individuals in a population.
References in periodicals archive ?
Furthermore, these three PCs explained less than half the total phenotypic variance, and only 75% of the total phenotypic variance was explained when all eight components with eigenvalues greater than one were retained.
Effect of accounting for different phenotypic variances by sire breed and sex on selection of sires based on expected progeny differences for 200- and 365-day weights.
The variance components were expressed as proportions of the phenotypic variance and are summarized in Table 6.
The phenotypic variance ([V.sub.P]) was separated into the additive genetic variance ([V.sub.A]), non-additive genetic variance ([V.sub.N] and environmental variance ([V.sub.E]), and the environmental variance ([V.sub.E]) was separated into the common environmental variance ([V.sub.E]) and the specific environmental variance ([V.sub.ES) using the standard separation of variance components (Falconer 1989).
The contribution to the total phenotypic variance by multiple QTLs was estimated with the multifactor ANOVA model (SAS Institute 1988).
The contributions to phenotypic variance (CPV) explained by the significant association SNPs was calculated with GCTA software [17] using univariate restricted maximum likelihood.
Therefore, the genotypic variance (Vg), genotypic coefficient of variance (GCV), phenotypic variance (Vp), phenotypic coefficient of variance (PCV), environmental variance (Ve), and environmental coefficient of variance (ECV), broad sense heritability (h2), genetic advance (GA) and genetic advance as a percentage of the mean (GA%) for all traits are calculated and given below in Table 2.
For an efficient selection it is need to estimate the components of genetic and phenotypic variance, because through the relationship between the variances, it is possible to estimate the accuracy and heritability.
Estimated the direct additive and maternal heritabilities and ratio of permanent environmental variance on phenotypic variance are presented in Table 2.
Estimates of individual heritability in the narrow sense were obtained by dividing additive genetic variance by phenotypic variance, of which the results are interpreted as heritability of high magnitude ([h.sup.2.sub.a] [greater than or equal to] 0.50), heritability of average magnitude (0.15 [less than or equal to] [ha.sup.2.sub.a] < 0.50) and heritability of low magnitude ([h.sup.2.sub.a] < 0.15) (Resende, 2002).
A large proportion of the phenotypic variance ([[sigma].sup.2.sub.p]) for plant height was accounted for by the genotypic variance ([[sigma].sup.2.sub.g]) (Table 5).