Wize University Biology Textbook > The Cell Cycle
Binary Fission
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Binary Fission: Prokaryotic Cytokinesis
A form of asexual reproduction (daughter cells are identical to parent cell).
- Occurs mainly in single-celled organisms.
- All genetic material in the cell is replicated before cytokinesis (bacteria have extrachromosomal DNA like plasmids that are also replicated).
- When DNA is replicated, the origins (Ori site) are attached to the poles of the cells by the partitioning proteins ParA/ParB. This enables chromosomal segregation.
- Cytokinesis:
- Constriction of cells into two daughter cells is done by a cytoskeletal protein know as FtsZ.
- FtsZ proteins form a ring at the constriction site.
- The ring contracts to pinch the two cells apart.
Practice: Binary Fission
Which of the following is NOT true about binary fission?