BioCoach Activity

Concept 10: Meiosis II: Prophase II

Meiosis II begins without any further replication of the chromosomes. In prophase II, the nuclear envelope breaks down and the spindle apparatus forms.

To replay the prophase II animation, click the Replay button.

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animation

  • 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.