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Unformatted text preview: M itotic Cell Division Chromosomes are made up of chromatin. Chromosomes are present in the nucleus. 8 Histone (protein) associate together to form a spool Each group of Histone has 2 wraps of DNA. When cell is about to divide, chromatin become more intact Now you have a thicker thread and the thread forms more protein. Interphase is part of the cell cycle. Not all cells can divide (neurons). Time when cell is dividing: M Phase Mitosis & Cytokinesis (division of cytoplasm) When cell is not dividing: Interphase G1 (First Gap Phase)-Prepares for S Phase-Certain proteins need to be available in order to get to S Phase-Cell grows and prepares for S Phase S (Synthesis Phase)-Components of chromatin are being synthesized-Followed by synthesis of DNA, Histone DNA is being synthesized in the nucleus-DNA Synthesis G2 (Second Gap Phase)-Prepares for Mitosis & Cytokinesis-Protein Synthesis increases-Preparation for cell division M ITOSIS-Nuclear Division-Two nuclei identical to parent nucleus formed CYTOKINESIS-Cytoplasm divides-Two daughter cells Mitosis & Cytokinesis can overlap in time M ITOSIS-Preserves chromosome number in eukaryotic cell division-Identical chromosomes are distributed to each pole of the cell- Nuclear envelope forms around each group of chromosomes Phases of Mitosis-Propashe-Metaphase-Anaphase-Telophase Interphase (Part of cell cycle but not part of mitosis)...
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- Fall '09