Answer :
In anaphase I, homologouspairs are separated but sister chromatids stay joined together. The "I" in anaphase I refers to the first round of cell division, which resembles ordinary mitosis. So in anaphase I, the homologous pairs separate but the sister chromatids stay together. Then the cell goes directly into a second round of cell division - in anaphase II, the sister chromatids are separated into four (now haploid) cells.