The M stage of the cell cycle is when mitosis occurs. This is the process of nuclear division, where the duplicated chromosomes are separated into two new nuclei. It is followed by cytokinesis, which is the division of the cytoplasm, resulting in two daughter cells.

Here's a breakdown of the key events in the M stage:

Mitosis:

* Prophase: Chromosomes condense, the nuclear envelope breaks down, and spindle fibers form.

* Metaphase: Chromosomes align at the center of the cell, attached to the spindle fibers.

* Anaphase: Sister chromatids separate and move to opposite poles of the cell.

* Telophase: Chromosomes reach the poles, the nuclear envelope reforms around each set of chromosomes, and the spindle fibers disappear.

Cytokinesis:

* The cytoplasm divides, usually through the formation of a cleavage furrow (in animal cells) or a cell plate (in plant cells).

The M stage is a crucial part of the cell cycle as it ensures that each daughter cell receives a complete set of chromosomes, maintaining the genetic integrity of the organism.