Study of how epigenetic modifications are covalent modifications of DNA or histones that cause changes in gene expression and how epigenetic modifications appear to be a method through which nurture or the environment can influence nature. Emphasis on how experience or environmental factors epigenetically modify health or behavior of animals. Only one of the following may be counted: Biology 381K (Topic: Epigenetics), 382E, Molecular Biology 382E, Neuroscience 382E. Three lecture hours a week for one semester.