Some aspects of the contemporary sociobiology as it has been developing abroad, and particularly those crucial for the problem of the role of hereditory pre-conditions in man's psychological development - are critically analyzed. Relationship between genetical and psychological principles to be used in studies of a man's ontogenesis, as well as relative role of such intermediaries between the genotype and the mental phenotype as the organic growth and the intentional activity of the man as a particular personality - are discussed in the above context.