Anaphase I

In anaphase-I, the two homologous chromosomes of each pair are pulled apart from one another and carried toward opposite poles by the spindle apparatus — this separation of homologues is called disjunction. Crucially, the two sister chromatids of each individual chromosome do not separate at this stage; only the homologous pairs come apart. This is exactly why meiosis-I is called the reductional division — it is homologues, not chromatids, that separate here. The sister chromatids of each chromosome remain joined by a shared centromere, but by now they are no longer genetically identical to each other, since one o …