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sci.genetic-drift-effective-population Calculator
Calculates the effective population size Ne and expected allele frequency variance due to genetic drift: Var(Δp) = p(1−p)/(2Ne). Allele fixation probability equals initial frequency p — in small populations (Ne < 100), drift dominates selection for alleles with selective advantage s < 1/(2Ne).
Inputs
N E
Total number in the group you are studying. Matters for finite-population corrections when the sample covers a large fraction of the total.
P0
Cycles per second (Hz). Audible sound: 20 Hz – 20 kHz. Make sure units match what the formula expects.
T Gen
Reference formula or conversion factor shown for context.
Results
allele frequency variance Var(p)
Standard deviation squared — average squared deviation from the mean. Essential for ANOVA, regression, and many statistical tests, though the squared units make it less intuitive directly.
std deviation of p after t generations
Standard deviation -- the average spread of values around the mean. In a normal distribution: 68% within 1 SD, 95% within 2 SD.
expected heterozygosity retention
Sample size or count used in the calculation.
fixation probability (neutral allele)
The value at the specified point or condition.
mean time to fixation (generations)
The proportional relationship between two quantities.