BIOL 3113 Lecture Notes - Lecture 21: Cell Division, Sister Chromatids, Cytokinesis
Document Summary
The cell cycle is the series of events that occurs in the life of a eucaryotic cell from one cell division to the next. The eucaryotic cell cycle is divided into four phases: *m phase: mitosis - chromosome division, cytokinesis - cytoplasmic division. *g1 phase: period of normal cell function. Division of a eucaryotic cell (m phase) two daughter cells with the same chromosome complement as the parent cell. Three key features of the m phase of the cell cycle: *chromosome condensation - allows the chromosomes (dna + proteins) to be separated without becoming tangled: condensins - help to carry out chromosome condensation, cohesins - held two sister chromatids together. *mitotic spindle - provides the mechanism to separate the daughter chromosomes, composed of microtubules. *contractile ring (animal cells) - provides the force to divide the cell in two, composed of actin and myosin. Cell division = mitosis + cytokinesis: mitosis. Consists of 5 distinct stages: prophase, prometaphase, metaphase, anaphase, telophase.