From the figure above, describe the events occurring in each of the micrographs (A through H ) in the spaces provided below. (I have answered A-D for you!) Boxes A - D: Beginning in A, the chromosomes start to condense and become more visible as the spindle fibers begin to emerge from the centrosomes (remember these?). Boxes A-C indicate prophase. In box D, the chromosomes continue to condense, and the spindle microtubule fibers start to attach to the kinetochores of the chromosomes. This is prometaphase! Box E: Box F:.