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The heritability of a biometric characteristic is a function of the studied population: however it is important to define a decreasing order of heritability for different anthropological characteristics. We present a study of the heritability coefficients of 36 anthropological traits in a sample of 125 Belgian families. We utilized in the calculation of the heritability coefficients the method of Fisher (1918), which has the advantage that it takes into account the influence of the existing assortative mating in the studied population. The values of the heritability coefficients calculated for a theoretical panmictic population are compared to the heritability coefficients calculated in the observed conditions and a study of the variation in the order of the heritability coefficient is proposed.