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CELL DIVISION Chapter 10-2 CELL DIVISION Chromosomes are not visible in cells until cells begin the process of cell division. CELL DIVISION Chromosomes consist of two identical sister chromatids. CELL DIVISION A centromere holds the two sister chromatids together at their centers.

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chapter 10 2

CELL DIVISION

Chapter 10-2

slide2

CELL DIVISION

  • Chromosomes are not visible in cells until cells begin the process of cell division.
slide3

CELL DIVISION

  • Chromosomes consist of two identical sister chromatids.
slide4

CELL DIVISION

  • A centromere holds the two sister chromatids together at their centers.
slide5

CELL DIVISION

  • Cell Cycle
  • The cell goes through a stage called interphase between cell divisions.
slide6

The Cell Cycle

  • Cells grow and then divide in a series of events called the cell cycle.
slide8

The Cell Cycle

  • M phase is the when the nucleus divides.
slide9

The Cell Cycle

  • Interphase consists of:
  • G1 phase
  • S phase
  • G2 phase
slide10

The Cell Cycle

  • G1 phase - cells do most of their growing.
mitosis
Mitosis
  • Four phases:
    • Prophase
    • Metaphase
    • Anaphase
    • Telophase
mitosis14
Mitosis
  • Centrioles are the tiny structures located in the cytoplasm near the nuclear envelope at the beginning of prophase.
mitosis15
Mitosis
  • Spindle – is the fanlike microtuble structure that helps separate the chromosomes.
mitosis16
Mitosis
  • During Prophase:
  • the chromosomes become visible in the nucleus;
  • the centrioles take up positions on opposite sides of the nucleus.
mitosis17
Mitosis
  • During Metaphase:
  • The chromosomes line up in the center of the cell.
mitosis18
Mitosis
  • During Anaphase :
  • The chromosomes move until they form two separate
  • Forming groups at opposite poles of the spindle.
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Mitosis
  • During Telophase:
  • the nuclear envelope re-forms around each cluster of chromosomes;
  • the nucleolus becomes visible in each daughter nucleus.
cytokinesis
Cytokinesis
  • Cytokinesis is the division of the cytoplasm.
cytokinesis21
Cytokinesis
  • How does it happen in animals?
  • The membrane is drawn downward until it is pinched into nearly two equal parts.
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Cytokinesis
  • A cell plate is formed midway between the divided nucleus during cytokinesis in plant cells.