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Tetrads line up in the middle of the cell during metaphase I.
metaphase
Metaphase 1
During metaphase I of meiosis, tetrads line up along the equator of the cell. They are preparing for separation in the next phase.
DNA replication occurs during the S phase of interphase, which is the phase that precedes mitosis. In this phase, the DNA molecules in the cell's nucleus are duplicated, resulting in two identical copies of each chromosome.
Nucleus and nucleolus disappear during pro-phase stage of mitosis,to be specific it disappears in late pro-phase stage and reappers during telophase stage of mitosis.
the phase of mitosis when chromosimes are ligned in the middle of the cell
Prophase.
Mitosis and cytokinesis occur during the mitotic phase of the cell cycle.
DNA duplication occurs during the interphase, specifically the S phase. After replication, the cell then enters the first active phase of mitosis.
Nuclear division by mitosis or meiosis
Mitosis occurs during the last phase- Telophase.