![]() F ST between the Eurasian and North American populations of the gray wolf were reported at 9.9%, those between the Red wolf and Gray wolf populations at between 17% and 18%. Values for mammal populations between subspecies, or closely related species, typical values are of the order of 5% to 20%. Also, strictly speaking F ST is not a distance in the mathematical sense, as it does not satisfy the triangle inequality.įor populations of plants which clearly belong to the same species, values of F ST greater than 15% are considered "great" or "significant" differentiation, while values below 5% are considered "small" or "insignificant" differentiation. In this case, the probability of identity by descent is very low and F ST can have an arbitrarily low upper bound, which might lead to misinterpretation of the data. The interpretation of F ST can be difficult when the data analyzed are highly polymorphic. ![]() If p ¯ is the mutation rate per generation. Two of the most commonly used definitions for F ST at a given locus are based on 1) the variance of allele frequencies between populations, and on 2) the probability of Identity by descent. ![]() Developed as a special case of Wright's F-statistics, it is one of the most commonly used statistics in population genetics. It is frequently estimated from genetic polymorphism data, such as single-nucleotide polymorphisms (SNP) or microsatellites. The fixation index ( F ST) is a measure of population differentiation due to genetic structure.
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