In anaphase I the tetrad is pulled to separate polls and the sister chromatids, representing one chromosome. are still attached. In anaphase II these sister chromatids are pulled to the polls again...
In anaphase for both types of cell division, the centromeres of each chromosome separates and the spindle fibers pull apart the sister chromosomes. In mitosis, this is the shortest phase of cell...
a. chromatids do not separate at the centromere in anaphase I.b. centromeres do not exist in anaphase I.c. crossing-over occurs only in anaphase of miitosis