Selection + Drift Simulator
Simulates allele frequency change when selection and genetic drift act together. Each generation first applies selection using genotype fitness values, then applies Wright–Fisher sampling in a finite population.
Selection step: p* = (p²wAA + pqwAa) / w̄ | w̄ = p²wAA + 2pqwAa + q²waa
Drift step: next generation A alleles ~ Binomial(2N, p*) | p(next) = sampled A / 2N
Drift step: next generation A alleles ~ Binomial(2N, p*) | p(next) = sampled A / 2N
Inputs
Starting Allele Frequency
Fitness Values
Population and Run Length
This simulator applies selection first and then drift within each generation. The columns p², 2pq, and q² are Hardy-Weinberg reference values based on the allele frequency at the start of that generation.
Results
Check pending
Starting p
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Starting q
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Generations Simulated
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Final p
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Final q
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First Generation w̄
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Interpretation
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| Generation | p | q | A alleles | a alleles | p² | 2pq | q² | w̄ | p after selection | A after drift | p(next) |
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| No simulation yet | |||||||||||