Reverting to Ancestral Quality

This page is the CodyCross answer for the clue below from All Things Water, Group 1284, Puzzle 4 (Arctic Ocean).

Question is: Reverting to Ancestral Quality

and the answer is: ATAVISTIC

Word Meaning:

ATAVISTIC — (biology) Of the recurrence of a trait reappearing after an absence of one or more generations due to a chance recombination of genes.

Definitions from Wiktionary.