The chromosomes in a cell's nucleus coil during prophase of mitosis in order to facilitate mobility. The chromosomes and the DNA become coiled and condensed during prophase.
Mitosis is a process by which cells replicate in order to repair and regenerate cells in the human body. During the process of mitosis, there are four distinct phases: prophase, metaphase, anaphase and telophase. Each phase is marked by chromosomal movement, and eventually the process ends with the production of an identical daughter cell. The first step of mitosis is prophase. During this step the chromosomes condense and coil into smaller sizes so that they can easily travel around the cell while it is duplicating.