Fig. 1: A triangle plot illustrating the theoretical expectations for combinations of hybrid index and interclass heterozygosity under Hardy-Weinberg Equilibrium (HWE).

Large, colored points identify parental taxa (P1, P2) and hybrid classes (F1 = first filial generation, F2 = second filial generation, BC = backcross and the number of generations backcrossed toward the nearest parental population). Smaller black points show all possible combinations of hybrid index and interclass heterozygosity after six generations of mixing under HWE.