Figure 1From: Towards Systems Biology of Heterosis: A Hypothesis about Molecular Network Structure Applied for the Arabidopsis MetabolomeDefinition of heterosis. (a) Quantitative genetics definition of midparent heterosis and best-parent heterosis (heterosis effect: arrows); (b) example from early development in Arabidopsis thaliana—cotyledon areas are the largest in heterozygous crosses (c, d) as compared to their homozygous parents (a, b).Back to article page