What are spindle fibers in mitosis?
They are the microtubule fibers that the centromeres of chromosomes follow along upon anaphase. Spindle fibers push chromosomes to the center, the metaphase plate, in metaphase. Spindle fibers that do not attach to a chromosome’s centromere continue to grow and push each side from each other, aiding the cell in elongating. Sorry for messing up the order ~ metaphase > anaphase.