Atavism
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The term atavism (derived from the Latin atavus, a great-grandfather's grandfather and, thus, more generally, an ancestor) denotes the tendency to revert to ancestral type. An atavism is a real or supposed evolutionary throwback, such as traits reappearing which had disappeared generations ago. Atavisms occur because genes for previously existing phenotypical features are often preserved in DNA, even though the genes are not expressed in some or most of the organisms possessing them.
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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Atavism" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.
