Table 3.

Cytoplasmic marker frequencies after 100 generations of cyto-symbiote hitchhiking in the FCS model for various vertical transmission rates (v) and fitness effects.

v	s = 0.10	0.15	0.20
p0 = 0.001
0.90	0.006	0.038	0.095
0.95	0.039	0.100	0.164
0.99	0.082	0.151	0.215
p0 = 0.50 (admixture)
0.90	0.711	0.777	0.818
0.95	0.752	0.805	0.838
0.99	0.775	0.821	0.849
Contact zone midpoint
0.90	0.627	0.680	0.712
0.95	0.671	0.709	0.734
0.99	0.692	0.725	0.747
Contact zone with epistasis
0.90	0.591	0.673	0.725
0.95	0.655	0.705	0.735
0.99	0.668	0.708	0.736

The first case (p₀ = 0.001) represents an initially rare symbiote in a panmictic population, and the second (p₀ = 0.50) represents 1:1 admixture (the cytoplasmic marker was initially perfectly associated with the advantageous symbiote). The third and fourth cases represent contact zones (mean allele frequencies of demes 50 and 51 out of 100 total stepping stones). In the first three cases, the symbiote is universally advantageous (s = s₁ = − s₂). In the final, epistatic case s₂ = $\frac{1}{2}$s₁.