atavistic
atavistic (adj)
English Definitions:
atavistic, throwback(a) (adj)
characteristic of an atavist
atavistic (Adjective)
of the recurrence of a trait reappearing after an absence of one or more generations due to a chance recombination of genes.
atavistic (Adjective)
of a throwback or exhibiting primitivism.
atavistic (Adjective)
relating to earlier, more primitive behavior that returns after an absence.
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 (neoteny) 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. The word atavism is derived from the Latin atavus—a great-great-great-grandfather or, more generally, an ancestor.
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