Final answer:
The three classes of microtubules that make up the mitotic spindle are kinetochore microtubules, polar microtubules, and astral microtubules.
Step-by-step explanation:
The three classes of microtubules that make up the mitotic spindle are:
- Kinetochore microtubules: These microtubules attach to the kinetochores of chromosomes and are responsible for pulling the chromosomes to opposite poles during cell division.
- Polar microtubules: These microtubules extend from the two opposite ends of the cell and overlap in the middle, providing stability and contributing to the overall structure of the spindle.
- Astral microtubules: These microtubules radiate outwards from the spindle poles towards the cell periphery, helping to position the spindle within the cell and ensuring proper cell division.