this is more like a question of development biology. gene regulation play important role during development of cell. so the common question is what decide the f

this is more like a question of development biology. gene regulation play important role during development of cell. so the common question is what decide the fate of cells? and this is difficult. the normal explanation in textbook: when embryo develop, cell grow up to specific type by many different way(surely gene regulation), and in the whole life of individual cell just mitosis.