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Before mitosis begins, the cell has already made new copies of each of its chromosomes. However, these new copies remain attached to the original chromosome. A dividing cell must be able to pull the copied chromosomes apart from the original copies, which is how the DNA is evenly divided when one cell splits into two.

Explanation:

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The cell has already made new copies of each one of its chromosomes before mitosis starts. The initial chromosome, however, remains connected to these new copies. The replicated chromosomes must be able to be taken away from the original copies by a dividing cell, which is how the DNA is split equally as one cell divides into two.

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