And that means as soon as the cell enters ProPhase of mitosis the DNA condenses from chromatin into chromosomes. So during the process of ProPhase our DNA is being condensed into chromosomes. Now recall that each animal cell contains a single centrosome and the centrosome is the region of the cell that contains two identical Centrios. Now, what happens in ProPhase is these two centriots begin to move to opposite ends as shown in the following diagram. And as they move to opposite ends the centrioles begin to synthesize the spindle apparatus also known as the mitotic spindle apparatus. And what the mitotic spindle apparatus consists of is special types of spindle fibers that are made from microtubules.