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Section 5-2 “Mitosis ”

Section 5-2 “Mitosis ”. Write everything that is BLACK. KEY CONCEPT Cells divide during mitosis and cytokinesis. DNA and histones. Supercoiled DNA. DNA double helix. Chromatin. When the cell grows large enough it needs to divide Cell Division is called Mitosis

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Section 5-2 “Mitosis ”

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  1. Section 5-2“Mitosis” Write everything that is BLACK

  2. KEY CONCEPT Cells divide during mitosis and cytokinesis.

  3. DNA andhistones SupercoiledDNA DNA doublehelix Chromatin • When the cell grows large enough it needs to divide • Cell Division is called Mitosis • First the DNA must coil up to make Chromosomes

  4. chromatid telomere centromere telomere Condensed, duplicated chromosome • 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 DNA strands in the nucleus are called chromatin

  5. Parent cell centrioles spindle fibers centrosome nucleus with DNA Mitosis produces 2 genetically identical daughter cells • Interphase prepares the cell to divide • During interphase, the DNA is duplicated

  6. Prophase: chromosomes condense and spindle fibers form • Mitosis divides the cell’s nucleus in 4 phases Draw a picture of this cell in your notes!

  7. Metaphase: chromosomes line up in the middle of the cell Draw a picture of this cell in your notes!

  8. Anaphase: sister chromatids separate to opposite sides of the cell Draw a picture of this cell in your notes!

  9. Telophase: the new nuclei form and chromosomes begin to uncoil Draw a picture of this cell in your notes!

  10. 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

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