Meiosis II begins without any further replication of the chromosomes. In prophase II, the nuclear envelope breaks down and the spindle apparatus forms.
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• While chromosome duplication took place prior to meiosis I, no new chromosome replication occurs before meiosis II.
• The centrioles duplicate. This occurs by separation of the two members of the pair, and then the formation of a daughter centriole perpendicular to each original centriole. The two pairs of centrioles separate into two centrosomes.
• The nuclear envelope breaks down, and the spindle apparatus forms.