Final answer:
During prometaphase, both chromosomal and polar spindle fibers form. The chromosomal spindle fibers attach to the kinetochores of the sister chromatids, while the polar spindle fibers contribute to cell elongation. This process ensures proper chromosome alignment and segregation during cell division.
Step-by-step explanation:
During prometaphase, both chromosomal and polar spindle fibers form. The chromosomal spindle fibers attach to the kinetochores of the sister chromatids, while the polar spindle fibers overlap each other and contribute to cell elongation. This process ensures that all the sister chromatids are attached to microtubules from opposing poles, which is essential for proper chromosome alignment and segregation during cell division.