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# Malecot's method of coancestry

Malecot's coancestry coefficient, $f$ , refers to an indirect measure of genetic similarity of two individuals which was initially devised by the French mathematician Gustave Malécot.

$f$ is defined as the probability that any two alleles, sampled at random (one from each individual), are identical copies of an ancestral allele. In species with well-known lineages (such as domesticated crops), $f$ can be calculated by examining detailed pedigree records. Modernly, $f$ can be estimated using genetic marker data.

## References

• Malécot G. Les mathématiques de l'hérédité. Paris: Masson & Cie, 1948.
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