Here's why:

* Meiosis I: In anaphase I, homologous chromosomes (pairs of chromosomes with similar genes) separate and move to opposite poles. Each chromosome still consists of two sister chromatids attached at the centromere.

* Meiosis II: In anaphase II, the sister chromatids of each chromosome finally separate. These sister chromatids are now considered individual chromosomes.

Therefore, by the time anaphase of meiosis II is complete, each chromosome has only one chromatid.