What happens during metaphase?

During metaphase, which is the second stage of mitosis or meiosis, several key events occur:

Chromosomes Align: Chromosomes, which are already duplicated and composed of two sister chromatids, line up along the equatorial plane (metaphase plate) of the cell. This alignment ensures that each daughter cell will receive a complete set of chromosomes during cell division.

Spindle Fibers Attach: Special microtubule structures called spindle fibers (or mitotic spindles) from opposite poles of the cell attach to the centromeres of each chromosome. These spindle fibers play a crucial role in moving and segregating the chromosomes during later stages of cell division.

Checkpoint Control: Metaphase is also a checkpoint in the cell cycle where the cell ensures that all chromosomes are properly attached to the spindle fibers and aligned at the metaphase plate. This ensures that each daughter cell will receive the correct number of chromosomes.

Overall, metaphase is a highly organized and controlled stage of cell division, crucial for ensuring the accurate distribution of genetic material to daughter cells.