Table A1 The number of ways and likelihoods that A and B inherit organelle genes and contract the pathogen when both contract it horizontally (case iii, above)
| Description | Probability |  |  | θ′ |
|---|---|---|---|---|
| MA = MB = SA = SB |  | 1 | 1 | 1 |
| MA = MB = SA ≠ SB |  | 1 | Fs | Fs |
| MA = MB = SB ≠ SA |  | 1 | Fs | Fs |
| MA = MB ≠ SA = SB |  | 1 | 1 | 1 |
| MA ≠ MB = SA = SB |  | 1 | Fs | Fs |
| MA = SA = SB ≠ MB |  | Fc | 1 | Fc |
| MA ≠ MB = SA = SB |  | Fc | 1 | Fc |
| MA = SA ≠ MB = SB |  | Fc | Fs | θ |
| MA = SB ≠ MB = SA |  | Fc | Fs | θ |
| MA = SA ≠ MB ≠ SB |  | Fc | Fs | FcFs |
| MA ≠ SA ≠ MB = SB |  | Fc | Fs | FcFs |
| MA ≠ MB ≠ SA = SB |  | Fc | 1 | Fc |
| MA ≠ SB ≠ MB = SA |  | Fc | Fs | FcFs |
| MA = SB ≠ MB ≠ SA |  | Fc | Fs | FcFs |
| MA ≠ MB ≠ SA ≠ SB |  | Fc | Fs | FcFs |
Note that the probabilities of outcomes with SA = SB sum to 1/N, the probabilities of outcomes with MA = MB sum to 1/N♀, the probabilities of outcomes with MA ≠ MB sum to
, and the probabilities with SA ≠ SB sum to . MA(B) refers to the mitochondrial donor of individual A (or B). SA(B) refers to the symbiont donor of individual A (or B).
