[Genetic determination of growth processes in the peripubertal period of human ontogeny]

Chronological peculiarities of genetic determination of three factors of physical development in different phases of peripubertal stage of human ontogenesis were studied. The differences between sexes are explained by the hypothesis of mutual "clearing off" of X-linked genes' effects. This hypothesis is confirmed by the coincident dynamics of two indices--of additive genetic effects in boys and of nonlinear genetic effects in girls. The results point to autonomous nature of genetic determination of head's morphological structures, which is more expressed in boys. The component partitioning of the phenotype variance of the individual scores of linear discriminant functions revealed steady decrease across the peripubertal stage in the level of genetic determination of the variability of children's belonging to the different age periods. In the whole, the results indicate the existence of marked genetic determination of physique's growth and development in a stage under study of human ontogenesis.