Summary of the Cell Cycle in Eukaryotes.

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cell cycle

Cell cycle. Just like the organism as a whole, cells go through a kind of life cycle called the cell cycle. The diagram shows the four parts of the cycle.

G1 phase, the cell is doing its everyday job, be it as a nerve cell, enzyme secreting cell in the stomach or whatever.

At this time the chromosomes (2) each have just one molecule of DNA. Chromosomes with one strand of DNA are called unduplicated or unreplicated chromosomes.

S phase, the DNA replicates or duplicates.The chromosomes that result have two molecules of DNA and are called duplicated or replicated chromosomes.

G2 phase, the cell is carrying out processes necessary for mitosis to begin.

Mitosis. Mitosis is the stage of the cell's life cycle when the cell's DNA gets divided into two separate nucleii.

Cytoplasmic Division: As part of cell division the cytoplasm often is often divided between the daughter cells being produced.

Note! This process of cytoplasmic division, sometimes called cytokinesis, is a separate process from divsion of the genetic material in mitosis.

Daughter cells. The result of mitosis plus division of the cytoplasm is typically two genetically identical daughter cells. Both daughter cells are each smaller than the original parent cell and have unduplicated chromosomes.

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