Describe what happens during each of the four phases of mitosis

Prophase: First phase of mitosis during which chromatin condense into chromosomes, the nuclear envelope breaks down, centrioles separate, and a spindle begins to form.

metaphase: Second phase of mitosis during which chromosomes line up at the equator of the cell.

anaphase: Third phase of mitosis during which sister chromatids separate and move to opposite poles of the cell.

telophase: Last stage of mitosis during which chromosomes uncoil to form chromatin, the spindle breaks down, and new nuclear membranes form.