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Brief facts about atavistic:

In biology, an atavism is a modification of a biological structure whereby an ancestral genetic trait reappears after having been lost through evolutionary change in previous generations. Atavisms can occur in several ways, one of which is when genes for previously existing phenotypic features are preserved in DNA, and these become expressed through a mutation that either knocks out the dominant genes for the new traits or makes the old traits dominate the new one. A number of traits can vary as a result of shortening of the fetal development of a trait or by prolongation of the same. In such a case, a shift in the time a trait is allowed to develop before it is fixed can bring forth an ancestral phenotype. Atavisms are often seen as evidence of evolution. In social sciences, atavism is the tendency of reversion. For example, people in the modern era reverting to the ways of thinking and acting of a former time.

Atavistic regression - Atavistic regression is a hypnosis-related concept introduced by the Australian scholar and psychiatrist Ainslie Meares. Meares coined his term from the English atavism, which is derived from the Latin atavus, meaning a great-grandfather's grandfather and, thus, more generally, an ancestor.

Exaptation - Exaptation and the related term co-option describe a shift in the function of a trait during evolution. For example, a trait can evolve because it served one particular function, but subsequently it may come to serve another. Exaptations are common in both anatomy and behaviour.

Spandrel (biology) - In evolutionary biology, a spandrel is a phenotypic trait that is a byproduct of the evolution of some other characteristic, rather than a direct product of adaptive selection.

Torna atrás - Torna atrás or tornatrás is a term once used in 18th century Casta paintings to portray a mestizo or mixed-race person who showed phenotypic characteristics of only one of the "original races", such as European or Amerindian ancestry.

Evolutionary biology