Variation occurs during this event (late prophase I). Prophase 1 of Meiosis is the first stage of meiosis and is defined by five different phases; Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis[1] (in that order). read more
During this stage the nuclear envelope disintegrates and the replicated chromosomes become condensed. The spindle apparatus will attach to the centromeres at this time. Prophase I is unique because homologous chromosomes sets pair with each other and intertwine as a tetrad 7. read more