Mitosis is a cellular process that replicates chromosomes and produces two identical nuclei in preparation for cell division. Generally, mitosis is immediately followed by the equal division of the cell nuclei and other cell contents into two daughter cells.


We all started as one cell. That's pretty hard to imagine, but that's true. And now there's about a hundred trillion cells in each of our bodies, and they each have to carry the complete DNA instruction set. So that means when cells divide, a process has to occur of copying all of that. And that is mitosis, where each chromosome has to be turned into a pair, and then they have to split apart properly so that each of the daughter cells gets a complete set.

- Francis S. Collins, M.D., Ph.D.