In an actual breeding program, multiple locations and possibly multiple years are needed so allelic effects are estimated across a set of environments representative of those in which the cultivar is grown in subsequent seasons.
Additive genetic variance (A) denotes the variance resulting from the sum of allelic effects across multiple genes, while D symbolizes non-additive genetic effects including dominance and epistasis.
GCTA makes use of individual level genotype data from one contributing study as a reference to approximate the structure of LD across the locus, from which the covariance between allelic effects at multiple SNPs in the regression model can be estimated.
Similar genetic complexity, including multiple closely linked QTL with varying direction of allelic effects, has previously been reported for higher-resolution mapping of QTL in maize (Graham et al. 1997), Drosophila melanogaster (Pasyukova et al. 2000; De Luca et al. 2003), mice (Mollah and Ishikawa 2011), and rat (Granhall et al. 2006).
Thus, allelic effects were simulated multiplicatively on the original scale.
The allelic effects of these two recombinant alleles are quite different than 011.
Modeling can be more effective in predicting genotypic responses to abiotic stresses if allelic effects are simulated in current and future climate change scenarios; and if individual or multiple phenotypic traits are assessed to guide breeding of oilseed crops, especially those with a narrow genetic base due to monophyletic origin and selfpollination.
These data indicate that either association studies had some technical flaws or multiple GC variants in full or partial LD modulate vitamin D-related traits with opposite allelic effects.
Factors contributing to this genetic complexity include QTL previously detected as single QTL fractionating into multiple QTL for a given trait, tight linkages among QTL for multiple traits, the presence of previously unmapped horticultural trait QTL, and QTL with opposite directionality of allelic effects in different environments.
Furthermore, our simulations suggest that, even without correction for multiple testing, this approach will lack power compared to sex-differentiated tests of association when causal variants have allelic effects in both males and females, but which differ in direction and/or magnitude between them.
