During what phase of meiosis does both nuclei dissolve, spindle forms?

Prophase I

Events of Prophase I (save for synapsis and crossing over) are similar to those in Prophase of mitosis: chromatin condenses into chromosomes, the nucleolus dissolves, nuclear membrane is disassembled, and the spindle apparatus forms. Major events in Prophase I.

The next phase of meiosis is called Meiosis II. This begins with prophase II. During this stage the chromosomes condense once again, the nuclear membrane breaks down, and the spindle apparatus forms in each of the two new cells. This is followed by metaphase II.

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