Polar microtubules shorten during anaphase.
Late a is characterized by shortening of the kinetochore microtubules, while anaphase b movements lengthen the pole microtubules. This will move the two spindle poles further apart.
On the other hand, changes in microtubule length provide a mechanism for chromosome movement. more specifically, in the first part of anaphase, sometimes called anaphase A, the kinetochore microtubules shorten and pull the chromosome towards the spindle pole.
Chromosome segregation occurs in two stages. In anaphase a, the chromosomes move towards the spindle poles, and in anaphase b the spindle poles separate from each other. anaphase a requires chromosome-to-pole shortening of microtubules, whereas anaphase b requires this pole-to-pole shortening, resulting in microtubule lengthening.
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