How do some cells become brain cells and others become skin cells, when the DNA in ALL the cells is exactly the same. In other words, if the instructions are exactly the same, how does one cell become a brain cell and another a skin cell?
Some cells become brain cells and others become skin cells, when the DNA in ALL the cells is exactly the same due to a process called CELLDIFFERENTIATION.
CELL DIFFERENTIATION:
Cell differentiation is a process whereby a cell becomes specialized in function. Cell differentiation is a characteristics of stem cells.
Cell differentiation is, however, able to occur due to difference in geneexpression of the same DNA contained in each cell.
DNA (gene) of cells are expressed at different times and hence, cells become specialized. Therefore, some cells become brain cells and others skin cells because of this process.
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