The genetic material is transferred to the daughter cells and in subsequent generations through mitosis. Cells must have a way to remember the genes which are active before cell division and must follow the same pattern through mitosis into daughter cells. To remember which genes were active before the onset of mitosis, the active genes are in some way 'marked' and the daughter cells reassemble the transcriptional machinery on the promoters of those active genes. 'Gene bookmarking' is one of the mechanisms by which the phenotype is remembered through cell lineages.
Nutrigenomics is a branch of nutritional genomics which studies the interaction between nutrients and genes. Nutrients modulate the regulation and expression of coding genes of proteins, metabolism, cellular growth and differentiation. Nutrigenomics study focuses in discovering the specific response of each individual to food items, so that the individualized dietetic recommendations can be developed.