Additive genes underlie Mendelian inheritance and contribute to heterosis

Additive genetic effects explain Mendelian inheritance for four representative genes, while multi-gene additive interactions create non-additive hybrid effects and overdominance in compound traits.

• Why it matters: Mendel’s framework emphasized dominant characters, leaving intermediate traits less resolved; clarifying how intermediate and dominant patterns connect is key for predicting hybrid performance.
• What they did: Using genotypic and phenotypic data for four representative genes, the study decomposed inheritance into additive effects for component and compound traits and tested how additive interactions scale in hybrids.
• The result: Additive effects underlie both component and compound traits, and additive effects across more than two genes generate non-additive hybrid effects; overdominant grain yield depends on parental component-trait balance.

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