Mutant count: —
Fixation prob ρ: —
Neutral ρ₀: —
Fixations: 0 / 0
Empirical ρ: —
Mutant fraction
r=1: neutral drift
r>1: advantageous mutant
r<1: deleterious mutant
Selection vs drift: Ns≫1 → selection wins
Kimura (1962): ρ=1/N for neutral