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atavism (ătˈəvizəm), the appearance in an individual of a characteristic not apparent in the preceding generation. At one time it was believed that such a phenomenon was thought to be a reversion of “throwback” to a hypothetical ancestral prototype. The term is seldom used today since science has shown that such abnormal characteristics can be explained by the inheritance of a pair of recessive genes. See Mendel.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the appearance in organisms of features that are absent in their immediate ancestors but which did exist in very distant ancestors. An example of atavism could be the development of a caudal appendage in man, the appearance of two extra toes along the sides of the completely developed middle toe of the horse, or the development of pinnately compound leaves instead of phyllodes in the green wattle. Since to a certain degree individuals repeat the organizational features of their ancestors in the developmental process, a disturbance of normal development can lead to a situation in which the adult organism keeps for its entire life the ancestral features which normally appear in the embryo and usually disappear in the course of further development. An example of such atavism would be the appearance in man of a cervical fistula reminiscent of the gill slit of his mammalian ancestors, the fishes and amphibians. Polymastia in man (the formation of a larger than normal number of pairs of mammary glands), tridactylism in horses, and so forth, are also related to atavism. Atavism also includes the occurrence of features from distant ancestors in the regeneration of organs. In this instance, the organs regenerate with the features characteristic of the more ancient forms. Thus, in the regeneration of a lizard’s tail, the scale rings are sometimes formed in a more primitive shape. Upon regeneration of the anterior end of the body in certain annelids, head appendages are formed which are missing in the given form but which are inherent in its ancestors.


Shimkevich, V. M. Biologicheskie osnovy zoologii. 5th ed., vols. 1–2. Moscow-Leningrad, 1923–25.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


Appearance of a distant ancestral form of an organism or one of its parts due to reactivation of ancestral genes.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


the recurrence in a plant or animal of certain primitive characteristics that were present in an ancestor but have not occurred in intermediate generations
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
She's a superstar." The love of a good horse goes atavistically deep whatever the pattern on your flag.
(71) Ex-offenders, in effect, atavistically become tribe-like members of
In short, ex-offenders atavistically become tribe-like members of the state in which their conviction occurred, (364) ineradicably marked by the values and criminal law norms of their erstwhile residences, contrary to the free movement ideals of the nation's federal republic.
TEAC leaves the alignment issue to the program's discretion because there are instances where the state's or national agency's standards are contested (e.g., the issues of the teaching of creationism, prohibitions against bilingual education, ideologically driven reading methods, atavistically narrow conceptions of scientific research).
Instead of wondering how this genius emerged and gave expression to the shtetl imaginary and created even an artistic Zedde [grandfather and ancestor], a Shagal, who painted the 18th century Mohilev synagogue, thus giving to himself and all Israel some artistic yikhes [inheritance], Harshav acts atavistically as a member of the zaydene yidn [silk Jews=elite] disturbed that such talent could emerge from a herring dealer, such proste-yidn [crude=plain Jews]!
Kagan relished the irony of postmodern Europe, gasping from its gated community at brutish America on the outside, even as the United States atavistically guaranteed security for Europe's liberal-democratic union.
Let us not forget that the aristocratic music of the feudal period was played mainly by a caste of servants and something of the behaviour of servants (who as servants naturally try to steal a march on their lordships but at the same time pretend that they are actually just fulfilling their obligations) remains atavistically encoded in the mentality of orchestral musicians.
Unfortunately and atavistically, from my perspective, the tekke's women were elsewhere, either working in the kitchen along one side of the garden or sequestered in a room upstairs.
Lombroso addresses women's proclivity for crime in The Female Offender, explaining that, though a woman is much less likely than a man to commit crimes, "atavistically she is nearer to her origin than the male" (Lombroso and Ferrero 107).