Abstract
Backcross-derived homozygous lines of Atlas barley, isogenic except for two unlinked loci, A/a and B/b, each with two alleles, were crossed to produce five heterozygous genotypes. The nine possible genotypes were then used for detailed quantitative genetic studies at various stages in the life cycle of the plant. Components of genotypic variation attributable to additive, dominance and epistatic effects of genes were estimated by the use of the factorial genetic method. The relative magnitudes of these components for a single character were found to change considerably with the age of the plant and they also changed from character to character at the same age. Additive genetic effect, particularly of the A/a locus was the largest component of genotypic variation in the first 6 weeks of growth of the seedling. Epistasis was important at the very early stage of growth, but decreased strikingly in size at a time immediately following jointing. In general, the A/a locus was found to be genetically more active than the B/b locus for a number of metrical characters. Dominance effect of the A/a locus was responsible for about 50% of the total gene controlled variability for grain yield.
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