![]() Still, very rarely mistakes in copying or dividing chromosomes are made, and these mistakes can have negative consequences for cells and for people. Fortunately, our cells have amazing systems to copy chromosomes almost perfectly and to make sure that one copy goes to each daughter cell. We need each of our cells to receive exactly one copy of each chromosome, and each copy needs to be perfect, no mistakes, or the cells may have trouble following the genetic instructions. Otherwise, we might not be able to follow the instructions and things could go wrong. After the cytoplasm divides, cell division is complete. We don't want to accidentally give one person two copies of page four and one person zero copies of page four. While prophase, as described above, is the initial phase in both rounds of cellular division, prophase is just one part of a larger, complex process that creates gametes/sex cells. In mitosis, the nucleus divides followed by the cytoplasm dividing, resulting in two cells. Metaphase I: Instead of all chromosomes pairing up along the midline of the cell as in mitosis, homologous chromosome pairs line up next to each other. In prophase, the chromatin has condensed. With our instruction manual example, it is really important that each person gets one copy of every page. Notice that the chromatin is spread throughout the nucleus, and the nucleolus is visible. In mitosis, a cell copies each chromosome, then gives one copy to each of two daughter cells. During the four phases of mitosis, nuclear division occurs in order for one cell to split into two. ![]() ![]() Additionally, we’ll mention three other intermediary stages (interphase, prometaphase, and cytokinesis) that play a role in mitosis. Copy each page, then give one copy to each of two people. The four stages of mitosis are known as prophase, metaphase, anaphase, telophase. We can think about mitosis like making a copy of an instruction manual.
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