BSC 300 Lecture Notes - Lecture 22: G2 Phase, G0 Phase, Dna Replication
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9 Nov 2016
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The cell cycle is divided into periods of activity, growth and dna replication (interphase) and the much shorter phase of chromosomal segregation and cell division (m phase mitosis, followed by cytokinesis) Mitosis produces cells that are genetically identical to the parental cell. Meiosis produces cells (gametes) with half the genetic content of the parental cell, and through the process of recombination, no gamete has the exact same genome. Three general cell types based on their capacity to grow and divide: Fully differentiated: cells, such as nerve cells, muscle cells, or red blood cells, are highly specialized, have exited the cell cycle and have lost the ability to divide. They remain in that state until they die. G0 phase: quiescent cells have exited the cell cycle and exist in an extended g1-like state. Such cells perform semi-differentiated functions; however, they may be induced to re-enter the cell cycle in order to increase a cell population (for example in response to injury).
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