Table 1. Probabilities that an individual from the hybrid population at generation g has one of nine possible sets of parents from S₁, S₂, or H, assuming random mating.

Case	Female parent’s population	Male parent’s population	Probability
1	S1	S1	$s_{1,g-1}^{\text{f}}{s}_{1,g-1}^{\text{m}}$
2	S1	H	$s_{1,g-1}^{\text{f}}{h}_{g-1}^{\text{m}}$
3	S1	S2	$s_{1,g-1}^{\text{f}}{s}_{2,g-1}^{\text{m}}$
4	H	S1	$h_{g-1}^{\text{f}}{s}_{1,g-1}^{\text{m}}$
5	H	H	$h_{g-1}^{\text{f}}{s}_{g-1}^{\text{m}}$
6	H	S2	$h_{g-1}^{\text{f}}{s}_{2,g-1}^{\text{m}}$
7	S2	S1	$s_{2,g-1}^{\text{f}}{s}_{1,g-1}^{\text{m}}$
8	S2	H	$s_{2,g-1}^{\text{f}}{h}_{g-1}^{\text{m}}$
9	S2	S2	$s_{2,g-1}^{\text{f}}{s}_{2,g-1}^{\text{m}}$

The parameter $s_{\alpha ,g}^{\delta }$ is the probability that the parent of sex δ for a randomly chosen individual from the hybrid population, at generation g, is from the source population α. Similarly, the probability that this parent is from H is $h_g^{\delta }$.