The question asks about specific events and their corresponding stages in the cell cycle. (i) During Metaphase, chromosomes align at the spindle equator (equatorial plate), as mentioned in the context. (ii) Anaphase follows Metaphase in the mitosis stages listed in the context, during which centromeres split and chromatids separate. (iii) and (iv) refer to Meiosis events - pairing of homologous chromosomes (synapsis) occurs during Zygotene, and crossing over occurs during Pachytene, both stages of Prophase I in Meiosis.