The mitosis is a process of dividing the core in which are distributed equitably chromosomes (DNA strands) between the two daughter cells, so they have the same genetic information and also mirrors that of the cell that originated.
Remember that before mitosis begins, at the interphase, the DNA has been duplicated, although the chromosomes have not yet formed.
The mitosis, in beings unicellular and multicellular some, is a mechanism of asexual reproduction by can increase the number of individuals in the population. On the other hand, in multicellular beings, mitosis allows new cells to appear so that the individual can grow or to replace those that are dying.
The mitosis is a continuous, uninterrupted, but for study is divided into four phases: