How would you describe anaphase?

Anaphase is a crucial stage of mitosis characterized by the separation of sister chromatids. During this phase, the spindle apparatus plays a vital role as its microtubules contract. This contraction generates the force needed to pull the sister chromatids apart to opposite poles of the cell. As a result, each daughter cell will eventually receive an identical set of chromosomes following cell division.

The ability of spindle microtubules to change length and exert force is fundamental in this process, ensuring that the chromatids are accurately divided and that each daughter cell has the correct genetic information. The accurate distribution of genetic material is essential for maintaining genetic stability in the resulting cells.

The other options describe stages or characteristics not unique to anaphase. While option A mentions the presence of replicated chromosomes at the cell poles, this describes what happens after anaphase is completed. Option C describes metaphase instead, where chromosomes align at the equatorial plane. Option D refers to prophase, when chromatin condenses into visible chromosomes, and does not pertain to the separation process of anaphase. Thus, option B accurately depicts the mechanisms and events occurring during anaphase.