What do you see the biological meaning of the differential activity of genes in the cells of a multicellular organism?

Multicellular animals and plants begin their life cycle with one cell, then mitoses follow, and all cells contain the same genetic material, but have a certain structure that allows them to perform a number of specific functions more efficiently. The process of development of the body includes growth and differentiation. The reasons for this diversity of cells are not clear, but it is clearly associated with the induction and repression of genes. Differentiation is associated with various interactions of 3 factors: the nucleus, cytoplasm and the environment

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