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| The cell grows to its mature size, makes a copy of its DNA, and prepares to divide into two cells. Two cylindrical structures called centrioles are also copied. |
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| The cell membrane pinches in around the middleo f the cell. The cell splits in two. Each daughter cell ends up with an identical set of chromosomes and about half the organelles. |
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| The chromosomes begin to stretch out and lose their rodlike appearance. A new nuclear envelope forms around each region of chromosomes. |
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| Chromatin in the nucleus condenses to form chromosomes. The pairs of centrioles move to opposite sides of the nucleus. Spindle fibers form a bridge between the ends of the cell. The nuclear envelope breaks down. |
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| The chromosomes line up across the center of the cell. Each chromosome attaches to a spindle fiber at its centromere. |
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Definition
| The centromeres split. The two chromatids seperate, and each chromatid becomes a new chromosome. The new chromosomes move to opposite ends of the cell. The cell stretches out as the opposite ends are pushed apart. |
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