The atavism - appearance at a given individual weakened or incomplete pronounced signs, absent in close ancestors, but existed in distant ancestors. In some cases the throwback create the basis for the development of pathology, such as diaphragmatic hernia and other

The atavism (from lat. atavi - ancestors - the appearance of the descendants of the characteristics peculiar to distant ancestors, in the absence of these characteristics in the ancestors of the closer ones. The atavism known in plants, animals and humans. By Including Darwin, there are several forms A.; the most important of them: hybrid A. and spontaneous A. the Latter is divided into indifferent, i.e. harmless, and teratology, i.e. lead to deformities and diseases.