mitosis

Examples of mitosis in the following topics:

• Comparing Meiosis and Mitosis

  • Mitosis and meiosis share some similarities, but also some differences, most of which are observed during meiosis I.
  • Mitosis and meiosis are both forms of division of the nucleus in eukaryotic cells.
  • The main differences between mitosis and meiosis occur in meiosis I.
  • There is no such reduction in ploidy level during mitosis.
  • The daughter cells resulting from mitosis are diploid and identical to the parent cell.

• Interphase

  • Cells must grow and duplicate their internal structures during interphase before they can divide during mitosis.
  • The two centrosomes will give rise to the mitotic spindle, the apparatus that orchestrates the movement of chromosomes during mitosis.
  • The final preparations for the mitotic phase must be completed before the cell is able to enter the first stage of mitosis.

• Life Cycles of Sexually Reproducing Organisms

  • Germ cells are capable of mitosis to perpetuate the cell line and meiosis to produce gametes.
  • The haploid cells that make up the tissues of the dominant multicellular stage are formed by mitosis.
  • The zygote will undergo many rounds of mitosis and give rise to a diploid multicellular plant called a sporophyte.
  • Each spore gives rise to a multicellular haploid organism by mitosis.
  • The zygote will undergo multiple rounds of mitosis to produce a multicellular offspring.

• Sporophytes and Gametophytes in Seedless Plants

  • Sporophytes (2n) undergo meiosis to produce spores that develop into gametophytes (1n) which undergo mitosis.
  • When the haploid spore germinates in a hospitable environment, it generates a multicellular gametophyte by mitosis.
  • In the gametangia, precursor cells give rise to gametes by mitosis.

• Centrosome

  • In mitosis the nuclear membrane breaks down and the centrosome nucleated microtubules (parts of the cytoskeleton) can interact with the chromosomes to build the mitotic spindle .
  • During the prophase in the process of cell division called mitosis, the centrosomes migrate to opposite poles of the cell.
  • Interestingly, centrioles are not required for the progression of mitosis.
  • When the centrioles are irradiated by a laser, mitosis proceeds normally with a morphologically normal spindle.
  • During the prophase in the process of cell division called mitosis, the centrosomes migrate to opposite poles of the cell.

• The Mitotic Phase and the G0 Phase

  • Karyokinesis, also known as mitosis, is divided into a series of phases (prophase, prometaphase, metaphase, anaphase, and telophase) that result in the division of the cell nucleus .
  • Although the stages of mitosis are similar for most eukaryotes, the process of cytokinesis is quite different for eukaryotes that have cell walls, such as plant cells.
  • Karyokinesis (or mitosis) is divided into five stages: prophase, prometaphase, metaphase, anaphase, and telophase.
  • Describe the events that occur at the different stages of mitosis

• Introduction to Meiosis

  • Meiosis employs many of the same mechanisms as mitosis.
  • Because the events that occur during each of the division stages are analogous to the events of mitosis, the same stage names are assigned.

• Meiosis II

  • In contrast to meiosis I, meiosis II resembles a normal mitosis.
  • The mechanics of meiosis II is similar to mitosis, except that each dividing cell has only one set of homologous chromosomes.

• Fungi Reproduction

  • Perfect fungi reproduce both sexually and asexually, while imperfect fungi reproduce only asexually (by mitosis).
  • The most common mode of asexual reproduction is through the formation of asexual spores, which are produced by one parent only (through mitosis) and are genetically identical to that parent .

• Intermediate Filaments and Microtubules

  • Microtubules are part of the cell's cytoskeleton, helping the cell resist compression, move vesicles, and separate chromosomes at mitosis.