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Section 5-2 “Mitosis” Write everything that is BLACK 5.2 Mitosis and Cytokinesis KEY CONCEPT Cells divide during mitosis and cytokinesis. 5.2 Mitosis and Cytokinesis •When the cell grows large enough it needs to divide •Cell Division is called Mitosis •First the DNA must coil up to make Chromosomes DNA double helix DNA and histones Chromatin Supercoiled DNA 5.2 Mitosis and Cytokinesis DNA strands in the nucleus are called chromatin chromatid • One half of a duplicated chromosome is a chromatid • Sister chromatids are held together at the centromere • Telomeres protect DNA and do not include genes telomere centromere telomer Condensed, duplicated chromosome 5.2 Mitosis and Cytokinesis Mitosis produces 2 genetically identical daughter cells Parent cell • Interphase prepares the cell to divide • During interphase, the DNA is duplicated nucleus with DNA centrioles spindle fibers centrosome 5.2 Mitosis and Cytokinesis • Mitosis divides the cell’s nucleus in 4 phases Prophase: chromosomes condense and spindle fibers form 5.2 Mitosis and Cytokinesis Metaphase: chromosomes line up in the middle of the cell 5.2 Mitosis and Cytokinesis Anaphase: sister chromatids separate to opposite sides of the cell 5.2 Mitosis and Cytokinesis Telophase: the new nuclei form and chromosomes begin to uncoil 5.2 Mitosis and Cytokinesis • Cytokinesis (division of the cytoplams) differs in animal and plant cells –Cytokinesis splits the 2 new cells… –In animal cells, the membrane pinches closed –In plant cells, a cell plate forms
