This is really exactly the same quantity as the fixation index (equation 2.9)

The inbreeding coefficient and the fixation index are measures of excess homozygosity and therefore are just different ways of expressing the heterozygosity. Returning to Fig. 2.13 helps show the equivalence of the inbreeding coefficient, the fixation index, and the decline in heterozygosity in several specific cases of regular consanguineous mating. Remember that in all cases in Fig. 2.13, the Hardy-Weinberg expected heterozygosity is 1/2.

Allozygous genotype A homozygous or heterozygous genotype composed of two alleles not inherited from a recent common ancestor.

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