The main regularities of the occurrence of the period of early human ontogenesis are considered from the point of view of the A.A. Ukhtomskii's doctrine of dominant and his opinions about the biosocial nature of behavior. The individual learning taking place in the framework of the "mother-child" system by early forms of imprinting and by later imitation of action of adults promotes both formation of general, species-specific forms of behavior and assimilation of social traditions of this particular community. Whereas the maternal behavior is predominantly of the "species-specific" character and has "algorithm" common for everybody, the parent behavior is aimed at "subjectivization of the general," i.e., at transferring to progeny of species-specific and individual "dialects" of social behavior. As a whole, these two forms of behavior provide an opportunity of survival and adaptation of the young organism under conditions of the concrete, randomly varying, biosocial environment and formation of the active, goal-oriented nature of interaction with this environment.