How to use the allele frequency change under selection calculator
Find the new frequency of a recessive allele after one generation of selection against recessive homozygotes. Enter recessive allele frequency now, selection against recessive homozygotes in the fields above; the allele frequency next generation, change in allele frequency are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “selection against recessive allele”, “allele frequency after selection”, “natural selection change”, “calculate allele frequency change under selection”, “find allele frequency next generation”.
Formula
Variables
- q — Recessive allele frequency now
- s — Selection against recessive homozygotes
Worked example
With recessive allele frequency now = 0.2, selection against recessive homozygotes = 0.1, the calculator gives allele frequency next generation ≈ 0.1967871; change in allele frequency ≈ -0.00321285.
Frequently asked questions
What is the allele frequency change under selection calculator used for?
Find the new frequency of a recessive allele after one generation of selection against recessive homozygotes. It helps with questions such as “selection against recessive allele”, “allele frequency after selection”, “natural selection change”.
What is the formula for the allele frequency change under selection calculation?
Allele frequency next generation = q × (1-s × q) / (1-s × q × q). Change in allele frequency = [Allele frequency next generation]-q. Here q is recessive allele frequency now, s is selection against recessive homozygotes.
What inputs do I need for the allele frequency change under selection calculator?
You need recessive allele frequency now, selection against recessive homozygotes. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the allele frequency change under selection calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the allele frequency change under selection result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.