Prophase I: Chromosomes in the sex cell condense, pair up, and cross over. The Centrsomes attach microtubules to them as the nuclear envelope disintergrates.
Metaphase 1: the pairs of Homologous chromosomes get aligned in the center and the microtubules attach to the chromosomes
Anaphase: the Homologous Chromosomes get taken apart and move to opposite sides of the cell
Telophase I: the new nuclear envelope forms