Here's how it works:
* Spindle fibers are made of microtubules, which are long, thin protein filaments.
* During cell division (both mitosis and meiosis), the spindle fibers attach to the centromere of each chromosome.
* The spindle fibers then shorten and pull the chromosomes apart, ensuring that each daughter cell receives a complete set of chromosomes.
Let me know if you'd like more information about cell division!