Anaphase is the phase of mitosis in which the chromosomes separate and move to opposite ends of the cell.

• A. Anaphase
• B. Telophase
• C. Metaphase
• D. Prophase

Answer: (A)

This phase is defined by the separation of sister chromatids and their movement toward opposite poles. The cohesin holding the chromatids together is cleaved, freeing them. Kinetochore microtubules shorten to pull each chromatid toward the pole, while non-kinetochore microtubules lengthen to push the poles further apart, elongating the cell. This contrasts with prophase (chromosomes condense and the spindle forms), metaphase (chromosomes align at the center), and telophase (the nuclear envelope reforms and chromosomes de-condense). The described event—chromosome separation and movement to opposite ends—fits this phase perfectly.