Genetic analysis in statistics of the first degree was performed using the 6-parameter model of Hayman. The following traits were estimated: plant height, ear length, thermal internode thickness, tillering, weight of grains per ear and 1000 grain weight. A principal role in inheritance of the traits under study, except for terminal internode thickness, played effects of dominant action of genes being, as a rule, several times stronger than additive effects. The highest values among epistatic effects were obtained for interaction of the dd and aa type. Duplicative epistasis was found in some hybrids.
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