atavism

Definition

A reappearance or resurgence of a trait or characteristic that was previously lost or recessive in a group or individual.

हिन्दी एक समूह या व्यक्ति में पहले से ही खो जाने वाली विशेषता या गुण की पुनरावृत्ति या पुनर्जागरण

Example

"The geneticist studied the phenomenon of atavism in a rare genetic disorder."