Recombination Frequency Calculator

Work out recombination frequency instantly with clear inputs, formula shown and shareable results.

About Recombination Frequency Calculator

Divides recombinant offspring by total offspring; one percent recombination is defined as one centimorgan of map distance.

Formula

Recombination frequency

RF (%) = recombinant offspring / total offspring x 100; 1% RF = 1 centimorgan

Worked example

With the default values below, Recombination Frequency Calculator returns Recombination frequency of 9.000%. Change any input above and every figure here is recalculated in your browser.

Inputs used

Recombinant offspringaccepts 0–1,000,000: 45
Total offspringaccepts 1–1,000,000: 500

Results

Recombination frequency: 9.000%
Map distance: 9.000 cM
Parental-type offspring: 455
Linkage assessment: Linked

Step by step

1Values used
2Recombination frequency
3Recombination frequency= 9.000
4Map distance= 9.000 cM
5Parental-type offspring= 455
6Linkage assessment= Linked

Assumptions and limits

The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why does recombination frequency cap at 50 percent?

Multiple crossovers between distant loci restore parental combinations, so unlinked genes never exceed 50%.

Is map distance additive?

Only over short intervals; longer distances need Haldane or Kosambi corrections for double crossovers.