Metaphase is the shortest phase in mitosis, but it must be completed successfully for the new cells to be identical. This arrangement ensures that each new cell will receive one copy of each chromosomes. The spindle fibers pull and push the duplicated chromosomes to the middle of the cells.In metaphase chromosomes line up in a single file at the middle of the cell.Structure called spindle fibers form in the cytoplasm. The nucleus disappears, and the nuclear membrane breaks down. The coils from visible duplicated chromosomes. The copied chromatin coils together tightly.The nucleus disappears, and the nuclear membrane breaks down.In prophase copied DNA condenses into chromosomes.
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