When a cell reproduces itself normally by mitosis, the daughter cells have the same structure, and carry out exactly the same functions as the parent. A cell’s activity is governed by the chromosomes in the nucleus. Each chromosome is formed of a special nucleic acid called deoxyribonucleic acid, D.N.A., and along its length lie concentrations of organic chemicals, bases. These are different from each other, are called genes, and the total combination of them is the plan of a cell’s activities. At division the genetic blueprint is passed unchanged to the daughter cells, so a skin cell will not produce daughter stomach mucosa cells.
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