Ancestral Trait That Recurs, Like Humans With Tails

This page is the CodyCross answer for the clue below from Health and Fitness, Group 2129, Puzzle 1 (Yoga Classes).

Question is: Ancestral Trait That Recurs, Like Humans With Tails

and the answer is: ATAVISM

Word Meaning:

ATAVISM — The reappearance of an ancestral characteristic in an organism after several generations of absence; a throwback.

Definitions from Wiktionary.