Mitosis is conventionally divided into five stages known as prophase, prometaphase, metaphase ... cell receives an identical set of chromosomes. Finally, during telophase, a nuclear membrane ...

The stage of cell division when this alignment of the chromosomes occurs is called metaphase. A microtubule is about 25 nanometers in diameter, or roughly 4,000 times smaller than the width of a human ...

The membrane around the nucleus disappears. Metaphase Chromosomes and their copies line up in the middle of the cell. Anaphase Chromosomes and their copies are pulled to different ends of the cell.

The breakdown of the nuclear membrane is an essential step for ... The progression of cells from metaphase into anaphase is marked by the abrupt separation of sister chromatids.