THE PHASES OF MITOSIS

Lorissa Espino and Karlee Hallum

Prophase

This is the 1st phase of mitosis. In early Prophase the nucleolus disappears and Chromatin condenses to form visible chromosomes. Each chromosome consists of two chromatids connected by a centromere. Outside the nucleus, spindle fibers form between the centrioles, which migrate to opposite ends of the cell. At the end of prophase the nuclear membrane dissolves away


Metaphase

This is the 2nd phase of mitosis. The centromeres of each chromosome are attached to spindle fibers. The spindle fibers change length pulling the chromosomes into a line along the equator of the cell.


Anaphase

The 3rd phase of mitosis. The certromeres split, and the sister chromatids are the pulled to the opposite poles of the cell by the spindle fibers. This phase ends when the chromatids, now called daughter chromosomes, reach the poles and stop moving.


Telophase

This is the 4th and final phase of mitosis.During this phase, a nuclear membrane forms around each set of daughter chromosomes and the nucleus reappears in each nucleus. The daughter chromosomes then unwind into chromatin.


Cytokinesis

After mitosis is complete, two identical nuclei are formed. During cytokinesis, the sides of the cell pinch inward, dividing the cytoplasm and forming two daughter cells, each containing a complete copy of the parent cell's DNA.