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Mitosis Objectives

Mitosis Objectives. Explain how cells produce more cells Describe the process of mitosis. Vocabulary. cell cycle-the life cycle of a cell chromosome- two DNA molecules held together by a centromere h omologous chromosomes- similar chromosomes (46 in human body)

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Mitosis Objectives

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  1. Mitosis Objectives • Explain how cells produce more cells • Describe the process of mitosis

  2. Vocabulary • cell cycle-the life cycle of a cell • chromosome- two DNA molecules held together by a centromere • homologous chromosomes- similar chromosomes (46 in human body) • mitosis- the process of chromosome separation • Cytokinesis- the division of cytoplasm to form two daughter cells

  3. Mitosis

  4. What is it? • The process of cell division that forms two new nuclei, each of which has the same number of chromosomes

  5. Copying DNA (Interphase) • Before mitosis begins, chromosomes are copied • Each chromosome is then two chromatids

  6. Phase I: Prophase • Nuclear membrane dissolves • Chromosomes condense into rodlike structures • Centrioles move to opposite ends of the cell and spindle fibers stretch across the cell

  7. Phase II: Metaphase • Chromosomes line up along the equator of the cell • Homologous chromosomes pair up

  8. Phase III: Anaphase • The chromatids (after each chromosome is duplicated, the two copies are called this)separate and move to opposite sides of the cell

  9. Phase IV: Telephase • A nuclear membrane forms around each set of chromosomes • The chromosomes unwind • Mitosis is complete

  10. Cytokinesis • In cells that lack a cell wall, the cell pinches in two. • In cells that have a cell wall, a cell plate forms between the two new cells.

  11. Mitosis…

  12. Phases at same time…

  13. Mitosis

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