Epigenetics the study of how cellular mechanisms control gene and how gene expression impacts health and behavior. Bi-directionality how human psychologically develop both by genetic predisposition and by the environment. Epigenesist does not change the genome, but the way cells react to the environment. Epigenome tell genome what to do. Epigenesist is controlled by methyl groups and histones. Methyl groups binds to a gene and tells it to not express it. Methyl groups bind differently to different cells and that is how cells know what kind of cells they are. Histones control how tightly or loosely the gene is wounded. If they are more loosely wound the gene can express more and if they are tightly wound, they express less. An example, of epigenesist
