The diakinesis is characterized by the disappearance of the nuclear membrane, nucleolus and completion of spindle apparatus. The separation of bivalents is completed by the process called terminalization in which the movement of the chiasmata from the centromere towards the ends of the chromosome arms take place like a zipper and at the end of diakinesis the two chromatids and held together only at their ends by the centromeres. Now the bivalents become more thickened contracted and prominently visible. Prophas I ends here.
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