Meiosis StagesProphase I:
In prophase I of meiosis, the following events occur:
- Chromosomes condense and attach to the nuclear envelope.
- Synapsis occurs (a pair of homologous chromosomes lines up closely together) and a tetrad is formed. Each tetrad is composed of four chromatids.
- Crossing over may occur.
- Chromosomes thicken and detach from the nuclear envelope.
- Similar to mitosis, the centrioles migrate away from one another and both the nuclear envelope and nucleoli break down.
- Likewise, the chromosomes begin their migration to the metaphase plate.
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