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 ...

There are three phase transitions in a cell cycle: G1/S to initiate DNA synthesis, G2/M to enter mitosis, and metaphase/anaphase to exit mitosis. Different models of cell cycle regulation ...

Metaphase: The hallmark of this phase is the metaphase plate ... Telophase: Have students compare the progression through the cell cycle up to this point. Have them identify patterns in how the ...

Cell division, the basic means by which genetic information is passed from generation to generation, involves tightly coordinated movements of a cell's DNA. This page describes the major phases of ...

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.

With only half the DNA, when the parent cell combines with another parent cell, the proper amount of DNA is maintained. This solution is called meiosis. Mitosis describes the process by which the ...