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atavism (n.)

1833, in biology, "reversion by influence of heredity to ancestral characteristics, resemblance of a given organism to some remote ancestor, return to an early or original type," from French atavisme, attested by 1820s, said to have been coined by French botanist Antoine-Nicolas Duchesne, from Latin atavus "ancestor, forefather," from at- perhaps here meaning "beyond" + avus "grandfather," from PIE *awo- "adult male relative other than the father" (see uncle).

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Definitions of atavism from WordNet

atavism (n.)
a reappearance of an earlier characteristic;
Synonyms: reversion / throwback
From wordnet.princeton.edu