What happens during prometaphase of mitosis?
A.the mitotic spindle begins to form as the centrosomes, which produce the spindles, move away from each other
B.the nuclear envelope begins to break down and the microtubule spindle fibers emerging from the centrosomes begin to enter the nuclear area of the cell
C.the sister chromatids begin to separate, moving towards opposite ends of the cell as the microtubular spindle fibers shorten
D.two nuclei develop and encompass the chromosomes at each end of the cell
B. The nuclear envelope begins to break down and the microtubule spindle fibers emerging from the centrosomes begin to enter the nuclear area of the cell.
