Final answer:
During anaphase, the cell elongates and the chromosomes move towards the poles.
Step-by-step explanation:
In the phase of anaphase, the cell elongates and the chromosomes move towards the poles. During anaphase, the cohesin proteins degrade, causing the sister chromatids to separate at the centromere.
Each chromatid, now called a chromosome, is pulled rapidly toward the centrosome to which its microtubule is attached. This movement of the chromosomes towards the poles leads to the visible elongation of the cell.