Epigenetics is the study of how your behaviors and environment can cause changes that affect the way your genes work. Unlike genetic changes, epigenetic changes are reversible and do not change your DNA sequence, but they can change how your body reads a DNA sequence.
You have a predisposition for developing fingerprints.
Identical twins don't have the same fingerprints.
https://www.datebytype.com/blogs/view/120/Why-are-epigenetics-important-to-rh-negatives