Do I need to install anything?

No. It runs in any modern browser, free, with no account required.

For Hobbyists & Makers · Mutation–Selection

Mutation–Selection for a virus spread

Built for hobbyists & makers exploring it for fun. Play with real physics and math, no license and no setup — just open and tinker. Simulate a virus spread live below — adjust the inputs and watch it respond, right in your browser.

Mutation–Selection BalanceLive

evolution of an allele

Controls

Presets

Selection coefficient s

Mutation rate µ

Starting frequency p₀

Selection pushes a favorable allele toward fixation, while mutation keeps feeding the alternative back in. The two forces settle at a mutation–selection balance — which is why harmful alleles never fully disappear from a population. Educational tool.

▶ Run in Python

Data Inspector

Equilibrium frequency0.043

Directionfalling

Governing equation

\overset{q}{^} = \frac{μ}{s} = \frac{0.001}{0.1} = 0.100

Reading this result: Selection pushes the allele up while mutation feeds the alternative back in; they settle at the equilibrium frequency shown.

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Frequently asked questions

Is this good for hobbyists & makers?: Yes — this version of "Mutation–Selection for a virus spread" is framed for hobbyists & makers exploring it for fun. Play with real physics and math, no license and no setup — just open and tinker.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.