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Homologous chromosomes pair up in the nucleus of the original cell. The nuclear membrane breaks down.

The cell pinches in the middle. New nuclear membranes form around the two groups of chromosomes.

The original cell divides completely into two daughter cells.

The chromosomes are pulled apart in each daughter cell. Each chromosome is made of two identical chromatids. Each chromatid is pulled to an opposite side of the cell.

Both daughter cells divide completely into two daughter cells. This results in four total daughter cells.

The chromosomes line up in the center (middle) of each daughter cell.

Both daughter cells pinch in the middle. A new nucleus begins to form around both groups of chromosomes.

Homologous chromosome pairs line up in the center (middle) of the cell.

Homologous chromosome pairs are pulled apart. One chromosome from the pair moves to one side of the cell. The other chromosome moves to the opposite side of the cell.

DNA replicates.

The nucleus in each daughter cell dissolves (breaks apart) and disappears (cannot be seen).