Sister chromatids move because kinetochore microtubules attach to them during metaphase and shorten during anaphase. As they shorten, the mirocrotubules pull each sister chromatid toward an opposite pole of the cell, ensuring that only one copy of DNA is present in each daughter cell.Continue Reading
Mitosis begins after interphase ends, and the nuclear material of the cell is replicated. The first phase of mitosis is called prophase, during which the DNA that has been replicated condenses into an X-shaped body. The next phase is called prometaphase; during this stage, the nuclear membrane breaks down into vesicles, which allows microtubules to invade the nuclear space of the cell.
Metaphase follows prometaphase, when the chromosomes begin to align at the equator of the cell and the microtubules from each pole attach to the kinetochores of the chromosomes. Anaphase is the next phase, and it marks the separation of the sister chromatids. It is divided into two parts: anaphase A, during which the kinetochore microtubules shorten and pull the sister chromatids toward each separate pole, and anaphase B, during which astral microtubules separate the poles further apart, separating the sister chromatids even more.
The last two phases are telophase and cytokinesis. In telophase, the mitotic spindle disintegrates after the chromatids arrive at their separate poles. During cytokinesis, the cell splits in half after the creation of a cleavage furrow, which bisects the cell, marking the end of cell division and the creation of two daughter cells.Learn more about Cells
The 5 phases of mitosis are prophase, prometaphase, metaphase, anaphase and telophase. These phases form a nuclear division that produces two daughter cells.Full Answer >
If mitosis skipped metaphase, the cell would most likely not divide, because the chromosomes must be in the center of the cell in order for anaphase to complete properly. However, it is still possible for the cell to split, but it would leave one daughter cell without chromosomes.Full Answer >
Specialized microtubules called kinetochore fibers attach a chromatid to a polar spindle fiber bundle at the kinetochore region of its centromeric DNA. A combination of chemical and physical forces hold the spindle fibers in place and align the sister chromatids.Full Answer >
The main events of meiosis include prophase, metaphase, anaphase and telophase. A cell in meiosis goes through two divisions, meiosis I and meiosis II, in which each division consists of the same stages to produce gametes or sexual reproduction cells.Full Answer >