Hybridlab results for simulation of different levels of intercrossing and backcrossing to each parental species. Simulations were undertaken for different levels of intercrossing (F) and backcrossing (bx) (A) Dots show the % of hybrids exhibiting significant genomic admixture; bars show mean genomic admixture proportions for simulated individuals detected as significantly admixed (+/- 95% confidence interval). (B) Bias in mean admixture proportion for individuals detected as significantly mixed, expressed as deviation of observed data from the theoretical expectation for the level of crossing (i.e. F1 = 0.5; first generation backcross = 0.75, etc.).