The centromeres do not separate during anaphase I, but during anaphase II in meiosis. In mitosis the centromeres split during anaphase.
Explanation:
Anaphase I begins when the two chromosomes of each bivalent (tetrad) depart and start driving toward opposite posts of the cell as a consequence of the action of the spindle. Mark that in anaphase I the sister chromatids remain connected at their centromeres and move collectively toward the poles.
