You are watching: What must happen to a chromosome before a cell starts mitosis?

Divide and also Split

Can friend guess what this colorful image represents? It reflects a eukaryotic cell during the process of cell division. In particular, the photo shows the cell nucleus of the cell dividing. In eukaryotic cells, the cell nucleus divides prior to the cabinet itself splits in two; and also before the nucleus divides, the cell’s DNA is replicated, or copied. There must be two duplicates of the DNA so the each daughter cabinet will have actually a finish copy the the hereditary material native the parental cell. Just how is the replicated DNA sorted and also separated so the each daughter cell gets a complete set of hereditary material? to answer the question, you very first need come know an ext about DNA and the forms it takes.


Figure (PageIndex3): Mitosis is the phase of the eukaryotic cell cycle that occurs between DNA replication and the formation of 2 daughter cells. Mitosis has 4 substages, prophase, metaphase, anaphase, and telophase.

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api/deki/files/18045/1024px-Mitotic_Metaphase.svg.png?revision=1&size=bestfit&width=291&height=244" />Figure (PageIndex5): Chromosomes, consist of of sister chromatids, line up at the equator or middle of the cell during metaphase. The blue lines space spindles, and the orange rectangles in ~ the cell poles space centrioles. Part spindles from the opposing centrioles affix with each other, and some spindles connect to the kinetochores of the sister chromosomes native their corresponding sides. Each chromosome is attached to two spindles.


During anaphase, sister chromatids separate and also the centromeres divide. The sisters chromatids room pulled personally by the shortening of the spindle fibers. This is a tiny like reeling in a fish through shortening the fishing line. One sister chromatid moves to one pole that the cell, and also the other sister chromatid move to opposing pole (see number (PageIndex6)). In ~ the finish of anaphase, each pole of the cell has actually a complete collection of chromosomes