So we separate our tetras. So during anaphase one, this junction occurs, that is, the chromosome pair in the tetra are separated two opposite poles. Now, notice one important point. So let's take a look at this tetrid here. So this chromatid and this chromatid are basically the same chromatid that we began with in this diagram before the S phase actually took place. So these are the two original homologous chromosomes where one came from the mother and one came from the father.