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The C ell Cycle. By: Russell Schmidt. 1.Interphase. In this p hase the cells start to grow. 90% of the cells life is spent in this phase. The cell starts to replicate its DNA. The cell also prepares to divide .

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The c ell cycle

The Cell Cycle

By: Russell Schmidt

1 interphase

In this phase the cells start to grow. 90% of the cells life is spent in this phase. The cell starts to replicate its DNA. The cell also prepares to divide.



Etymology: L, inter + Gk, phasis, phase

the stage in the cell cycle during which the cell is not dividing, the chromosomes are not individually distinguishable, and such biochemical and physiologic activities as DNA synthesis occur. Interphase follows telophase of one cell division and extends to the beginning of prophase of the next division. See also anaphase, interkinesis, karyostasis, metaphase, mitosis, prophase, telophase.

2 mitosis






n. Biology, pl., -ses (-sēz).1. The process in cell division by which the nucleus divides, typically consisting of four stages, prophase, metaphase, anaphase, and telophase, and normally resulting in two new nuclei, each of which contains a complete copy of the parental chromosomes. Also called karyokinesis.

2. The entire process of cell division including division of the nucleus and the cytoplasm


This the first of four phases in Mitosis. In this phase the nucleus starts to dissolve and the chromatin start to coil up into to rods that stretch across the cell.

pro·phase (prfz)


1. The first stage of mitosis, during which the chromosomes condense and become visible, the nuclear membrane breaks down, and the spindle apparatus forms at opposite poles of the cell.

2. The first stage of meiosis, constituted by a series of events that include the thickening and coiling of the chromosomes, synapsis of homologous chromosomes, tetrad formation, and crossing over.


In this part of Mitosis the rods of chromatin start to line up in the center of the cell. Spindle fibers start form from asters on each side of the cell.



Etymology: Gk, meta + phasis, appearance

the second of the four stages of nuclear division in mitosis and in each of the two divisions of meiosis, during which the chromosomes become arranged in the equatorial plane of the spindle to form the equatorial plate, with the centromeres attached to the spindle fibers in preparation for separation. See also anaphase, interphase, meiosis, mitosis, prophase, telophase.


The spindle fibers start to connect to the centromere. Then they start to split the crotomatids into two chromosomes on each side of the cell.

anaphase [ˈænəˌfeɪz]


1. (Life Sciences & Allied Applications / Biology) the third stage of mitosis, during which the chromatids separate and migrate towards opposite ends of the spindle See also prophase, metaphase, telophase

2. (Life Sciences & Allied Applications / Biology) the corresponding stage of the first division of meiosis


The nuclear membrane and nucleolous reappear. Chromosomes loosen up and become chromatids.

telophase (tl-fz)

The final phase of cell division, in which membranes form around the two groups of chromosomes, each at opposite ends of the cell, to produce the two nuclei of the daughter cells. The spindle disappears, and the cytoplasm usually divides (in the process called cytokinesis). In mitosis, telophase is preceded by anaphase. In meiosis, telophase occurs twice, once as part of the first meiotic division (when it is usually called telophase I) and once during the second meiotic division (when it is usually called telophase II). During telophase I, the members of pairs of homologous chromosomes which have separated during anaphase I (anaphase of the first meiotic division) regroup at the two ends of the cell. During telophase II, the individual chromatids that separated during anaphase II (anaphase of the second meiotic division) regroup at the ends of the cell. See more at meiosismitosis


The cytoplasm separates and each side becomes its own cell.

cy·to·ki·ne·sis (st-k-nss, -k-)


The division of the cytoplasm of a cell following the division of the nucleus