Epigenesis refers to the process of development of an organism from the fertilized egg or zygote, where genes are expressed and regulated in a specific manner. Synonyms for epigenesis include epigenetic regulation, epigenetic inheritance, and epigenetic control. Epigenetic regulation refers to the modifications that can occur to the DNA molecule that affect gene expression without altering the underlying DNA sequence. Epigenetic inheritance refers to the passing on of these modifications from one generation to the next, and epigenetic control refers to the ability to manipulate these modifications to regulate gene expression. Epigenesis is an essential process for the proper development and functioning of an organism, and understanding its regulation and control is important for various fields of research in biology and medicine.