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The stages of mitosis are: prophase, metaphase, anaphase and telophase. are shown in the diagrams below. There are 23 pairs of chromosomes in a diploid human body cell. Study cell division ...
- DNA and Chromosomes
Cell division - Edexcel DNA and chromosomes. Mitosis is a...
- DNA and Chromosomes
- Prophase. Prophase is the first step of mitosis. This is when the genetic fibers within the cell’s nucleus, known as chromatin, begin to condense and become tightly compacted together.
- Metaphase. Metaphase is the phase of mitosis that follows prophase and prometaphase and precedes anaphase. Metaphase begins once all the kinetochore microtubules get attached to the sister chromatids’ centromeres during prometaphase.
- Anaphase. The third phase of mitosis, following metaphase and preceding telophase, is anaphase. Since the sister chromatids began attaching to centrosomes on opposite ends of the cell in metaphase, they’re prepped and ready to start separating and forming genetically-identical daughter chromosomes during anaphase.
- Telophase. Telophase is the last phase of mitosis. Telophase is when the newly separated daughter chromosomes get their own individual nuclear membranes and identical sets of chromosomes.
Chromosomes carry genetic information in a molecule called DNA. A type of cell division called mitosis ensures that when a cell divides each new cell produced has the same genetic information.
- Regina Bailey
- Interphase. Before a dividing cell enters mitosis, it undergoes a period of growth called interphase. About 90 percent of a cell's time in the normal cell cycle may be spent in interphase.
- Prophase. In prophase, the chromatin condenses into discrete chromosomes. The nuclear envelope breaks down and spindles form at opposite poles of the cell.
- Metaphase. In metaphase, the spindle reaches maturity and the chromosomes align at the metaphase plate (a plane that is equally distant from the two spindle poles).
- Anaphase. In anaphase, the paired chromosomes (sister chromatids) separate and begin moving to opposite ends (poles) of the cell. Spindle fibers not connected to chromatids lengthen and elongate the cell.
The most basic function of the cell cycle is to duplicate accurately the vast amount of DNA in the chromosomes and then segregate the copies precisely into two genetically identical daughter cells. These processes define the two major phases of the cell cycle.
- Bruce Alberts, Alexander Johnson, Julian Lewis, Martin Raff, Keith Roberts, Peter Walter
- 2002
- 2002
Feb 2, 2023 · The daughter chromosomes are pulled towards the opposite end of the cell due to the contraction of the spindle fibers. At the end of this phase, each pole contains a complete set of chromosomes. 4.
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The process of mitosis. Before mitosis starts, all the chromosomes in the nucleus. replicate. their DNA to make identical copies. The nucleus now contains two sets of replicated chromosomes, twice...
