THE CELL CYCLE

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THE INTERPHASE

The Cell Cycle begins with the Interphase. The Interphase roughly makes up 4/5 to 5/6 of the cell's full cycle. The Interphase is split up into three parts: 1st the G1 period of Cell Growth, 2nd the S period, and 3rd the G2 period Growth and preparation for mitosis.

Mitosis is divided into four stages called PMAT. PMAT means: Prophase, Metaphase, Anaphase, and Telophase.

PROPHASE

During the Prophase the nucleous and nuclear membrane break down and disappear. Chromatin coils into chromosomes, and the centrioles form to draw the chromosomes in. Then polar fibers and kinetochore fibers extend from the spindle. The end of the Prophase is symbolized with the formation of asters.

METAPHASE

Metaphase is the second phase of Mitosis. During metaphase the chromosomes line up in the middle of the cell. They are held in place by kinetochore fibers.

ANAPHASE

Anaphase is the third phase of Mitosis. The centormeres separate and the chromatids move to opposite sides of the cell. The fibers draw the chromatids in. The chromatids unwind to chromatin in their separate cells.

TELOPHASE

Telophase is the last phase in Mitosis. The two identical sets of chromatids are at the two ends of the cell.

CYTOKINESIS

Cytokinesis occurs last of all and involves the dividing up of the cytoplasm and the organelles (not counting the Nucleous)

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