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Atavism is a tendency to reproduce ancestral type in plants and in animals; to resemble one's grandparents or great-grandparents more than parents. Atavism is the tendency of reversion. Atavism is people in the modern era reverting to the ways of thinking and acting of a former time. The word atavism is derived from the Latin atavus, which means an ancestor. Atavism means a throw back.

Atavism is the tendency of animals or plants to revert to an ancestral type, that is, resemblance to more remote ancestors rather than to parents. This concept of atavism was used by Cesare Lombroso (1835-1909) to describe a type of criminal he called the born criminal. According to Cesare Lombroso, the atavistic criminal was one representing an earlier stage of human evolution. This ancestral type of atavism was identified by Lombroso through several stigmata or physical characteristics like the length of ear lobes and fingers, and also the bone structure of the head.

Atavism (Latin atavus, a great-grandfather's grandfather) denotes the tendency to revert to ancestral type. Atavism is an evolutionary throwback, traits reappearing which had disappeared generations ago. Atavisms occur because genes for previously existing phenotypical features are often preserved in DNA, though the genes are not expressed in some or most of the organisms possessing them.

In biology, atavism is generally understood as a biological phenomenon which brings to sight a recurrent phenotypic character which was lost for extinct generations. Hallux valgus cannot be considered as an atavism because clinical history and findings do not correspond to the archaic prehensile foot and its evolution. - - Hallux valgus, an atavism? - Klaue K. 

Ethno-nationalism in process: ethnicity, atavism and indigenism in Riau, Indonesia - Author: Wee V.
Abstract: This paper briefly highlights Riau accounts of the struggle for independence (1945-65), shows how atavism and indigenism have been symbolically and ritually realized on the ground (1965-97) and examines some key developments in Riau after the fall of Suharto (1997-2001).