Main Page | See live article | Alphabetical index In general fission is a splitting or breaking up into parts. In physics, nuclear fission is a process where a large nucleus such as uranium is split into two smaller nuclei. In biology, binary fission refers to the process whereby a prokaryote reproduces by cell division. It is similar to mitosis and meiosis in eukaryotes. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.