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The Cell Cycle

In the cell cycle is the life cycle of a cell. It is can be divided into two main parts: Interphase and Mitosis.

Interphase is the longest phase, where the cell prepares to divide. Interphase can be divided into three portions. First Growth Phase (G1), Synthesis Phase (S) and Second Growth Phase (G2). In the G1 phase, the cell grows, makes new proteins and organelles. In the S phase, the cell creates a copy of its DNA. In the G2 phase, the cell makes organelles and other cell parts in preparation for cell division.

Mitosis is when the cell division actually occurs. Mitosis can be broken down into Prophase, Metaphase, Anaphase and Telophase. During Prophase, the chromosomes condense and become more visible. Spindle fibres begin to form and move to the poles of the cell. The nuclear membrane starts to disappear. During Metaphase, the fibres attach to the centromeres of the chromosomes, which are now lined up along the middle of the cell. During Anaphase, the spindle fibres retract to split the sister chromatids of each chromosome apart – to opposite sides of the cell. During Telophase, the last phase of Mitosis, the chromosomes and the organelles have been divided into two equal portions.

Cytokinesis occurs after Mitosis. This is when the cell actually splits into two cells, called daughter cells.

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