Requires that a cell plate be synthesized between the two daughter cells. Two daughter cells, each with one nucleus. In animal cells, cytokinesis results when a fiber ring composed of a proteinĬalled actin around the center of the cell contracts pinching the cell into Partitioning of the cell may also begin during this stage. The spindle fibers disperse, and cytokinesis or the Mitosis can be further subdivided into four main phases: prophase, prometaphase, metaphase, anaphase and telophase (PPMAT). The chromosomes disperse and are no longer visible under The spindle microtubules and through the physical interaction of polar microtubules.Ĭhromatids arrive at opposite poles of cell, and new membranes form around theĭaughter nuclei. Motion results from a combination of kinetochore movement along The paired chromosomes separate at the kinetochores and move to opposite sides Will receive one copy of each chromosome. That in the next phase, when the chromosomes are separated, each new nucleus Line is referred to as the metaphase plate. Spindle fibers align the chromosomes along the middle of the cell nucleus. Microtubules attachĪt the kinetochores and the chromosomes begin moving. ProteinsĪttach to the centromeres creating the kinetochores. Additional InformationThe phases involved in cell division are prophase, prometaphase metaphase, anaphase, and telophase. These phases occur in strict sequential order, and cytokinesis - the process of dividing the cell contents to make two new cells - starts in anaphase or telophase. The nuclear membrane dissolves, marking the beginning of prometaphase. Each meiotic division is divided into four phases: meiotic prophase, meiotic metaphase, meiotic anaphase and meiotic telophase with the first meiotic prophase. Some textbooks list five, breaking prophase into an early phase (called prophase) and a late phase (called prometaphase). Some fibersĬross the cell to form the mitotic spindle. ![]() ![]() To opposite ends of the cell and fibers extend from the centromeres. The cell may contain a pair of centrioles (or microtubule organizing centers in plants) both of which are organizational sites for microtubules.Ĭhromatin in the nucleus begins to condense and becomes visible in the light Chromosomes are not clearly discerned in the nucleus, although a dark spot called the nucleolus may be visible. The cell is engaged in metabolic activity and performing its prepare for mitosis (the next four phases that lead up to and include nuclear division). Interphase is often included in discussions of mitosis, but interphase is technically not part of mitosis, but rather encompasses stages G1, S, and G2 of the cell cycle. ![]() Also: The spindle breaks down Chromosomes unravel and so are invisible under light microscopy The cell is now preparing for the final stage in the cell cycle, cytokinesis. Mitosis is nuclear division plus cytokinesis, and produces two identicalĭaughter cells during prophase, prometaphase, metaphase, anaphase, and Telophase Telophase basically describes the series of events that sees new nuclear envelopes form around each set of sister chromatids - now located at the poles of the cell.
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