mitosis

• three main reasons of mitosis

  • growth
  • repair/healing
  • asexual reproduction
• cells that divide constantly

  • Epithelial Cell
  • Intestinal Cell
• cells that divide rarely

  • brain cell - nerve cell
  • spinal cord cell
  • cardiac cell
• 2 kinds of cell division

  • mitosis
  • meiosis
• mitosis - division of somatic cells
• meiosis - division of new sex cells
• somatic cell - a body cell; a cell whose genes will not be passed on to future generations.
• Germ cell - A cell that produces gametes, such as sperm or egg cells. a cell whose genes can be passed on to future generations
• diploid (2N) - 2 sets of chromosomes, one from each parent
• haploid (N) - a cell with 1 chromosome set in each of its cells; all gametes

  (sperm, eggs)
• characteristics of mitosis

  • ADIPLOID CEIL WILL GIVE RISE TO ADIPLOID CELL
• cell cycle - a typical cell goes through a process of growth, development, and reproduction called the cell cycle.
• interphase - longest phase in the cell cycle
• three stages of interphase

  • G1 (Gap 1)
  • S (synthesis)
  • G2 (Gap 2)
• All living cells come from other living

  cells.
• Mitosis produces two genetically

  identical cells.
• Prophase - chromosomes condense and the nuclear membrane breaks down
• metaphase - chromosomes line up along the middle of the cell
• anaphase - sister chromatids separate and move to opposite poles of the cell
• telophase - the nuclear envelope reforms and the chromosomes are pulled to opposite poles
• cytokinesis - the division of the cytoplasm into two daughter cells
• Cytokinesis in animal - In animal cells, a Cleavage Furrow forms and separates Daughter Cells.
• Centrioles - are small cylindrical structures made of microtubules found near the nucleus during interphase.