Dental Admissions Test (DAT) Practice Test

During mitosis, the spindle apparatus is formed by microtubules. Microtubules are a component of the cytoskeleton and are essential for various cellular processes, including cell division. They play a critical role in separating the duplicated chromosomes during mitosis by forming the spindle apparatus, which helps to pull the chromosomes apart into the newly forming daughter cells.

The other options, incomplete dominance, phenotype, and unipotent, are unrelated to the formation of the spindle apparatus during mitosis and are not directly involved in the cellular process of cell division.