Epigenetics “investigates heritable changes in gene expression occurring without changes in DNA sequence”(A. Baccarelli, V. Bollati). It focuses on what occurs in the environment and how it affects the appearance of genes. Andrea Schmitt, Berend Malchow, Alkomeit Hasan, and Peter Falkai, all state that “environmental factors may also impact brain development” (Schmitt, Malchow, Hasan, Falkai). Epigenetics are the reason for the fact that a liver cell isn’t the same as an eye cell. The proteins coat some of the DNA that has no use and therefore the cells become different even if they have the same genetic makeup
