Question

atavistic structure ​

Answer 1

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★彡 $\huge{\pink {ANSWER}}$ 彡★

In biology, an atavism is a modification of a biological structure whereby an ancestral traitreappears after having been lost through evolutionary change in previous generations.[3] Atavisms can occur in several ways;[4] 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 overriding genes for the new traits or makes the old traits override the new one.[3] 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.[5] Atavisms are often seen as evidence of evolution.[6]

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.