Epigenetics; the Study of How Cells Control Gene Activity without Changing the DNA Sequence

Epigenetics is the study of how changes in people's behavior & environment affect functioning of their genes. Unlike genetic changes, epigenetic changes are reversible and do not change the DNA sequence, but they can change how the body reads a DNA sequence. 

https://delightblogging.blogspot.com/2022/10/epigenetics-study-of-how-cells-control.html