What must happen before a body cell can begin mitotic cell division?
1) Its DNA must be replicated exactly so that identical copies of the cell's genes can be passed on to each of its offspring.
2) The DNA undergoes mutation in order to increase variation in the cell population.
3) Its DNA must be divided in half so that half can go to one daughter cell and half can go to the other daughter cell.
4) The DNA is expelled from the cell so that it will not be affected by the division process.