Work out genetic linkage map distance instantly with clear inputs, formula shown and shareable results.
Converts a recombination frequency into map distance using the Haldane and Kosambi mapping functions, which correct for undetected double crossovers.
Mapping functions
Haldane: d = -0.5 ln(1 - 2r); Kosambi: d = 0.25 ln((1 + 2r)/(1 - 2r)), both x 100 for centimorgans
Kosambi allows for crossover interference and usually fits real data better than Haldane.
Uncorrected distances compress at long range, so a genetic map built from raw frequencies is systematically too short.