BIOL130L Lecture Notes - Lecture 7: Chromatin, Nuclear Membrane, Microtubule
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22 Dec 2016
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The appearance of the nucleus and its chromosomes tell us a lot about what stage of the cell cycle a given cell is in. Nuclear division is called mitosis and cytoplasmic division is called cytokinesis, and they usually happen together, but they are not necessarily linked. The cell cycle consists of an interphase stage (takes up most of the cycle) and a mitosis stage (just a little bit) The interphase stage has 3 parts: g1 phase, s phase, g2 phase. As for the nucleus, it looks the same through all 3 stages of interphase, so you can"t tell what part of interphase a cell is in by looking at the nucleus. Each pair is held together by a centromere: g2 phase: the chromosomes are still bipartite more specifically, they are two double-stranded. Dna molecules called chromatids which are held together by centromeres, as stated earlier. Then mitosis happens there are 5 steps in mitosis (ppmat): prophase.
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