Changes

##[[centrioles]] move to opposite poles of the cell

##[[centrioles]] move to opposite poles of the cell

#Late prophase I.

#Late prophase I.

##nuclear envelope dissovles

##nuclear envelope dissolves

##[[nucleolus]] completely disappears

##[[nucleolus]] completely disappears

##crossing over of chromatids within bivalents may occur to form a [[chiasma]] (pl. chiasmata)

##crossing over of chromatids within bivalents may occur to form a [[chiasma]] (pl. chiasmata)