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The Cell Cycle

Walk-through of the cell cycle from Interphase to Mitosis
by

Tyler Gralheer

on 22 October 2012

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Transcript of The Cell Cycle

The Cell Cycle Interphase
Occurs before Mitosis

Cell spends most of its time in this phase

DNA starts as chromatin, thin threadlike coils, then changes to chromosomes composed of sister chromatids by the end of this phase

Chromosomes are copied Mitosis
Asexual Reproduction

Mitosis is the process in which the nucleus divides to form to new nuclei Three reasons cells undergo mitosis Growth Repair Replacement Structure of a Chromosome

Chromosome- genetic information

Chromatid- identical copies of genetic information

Centromere- area of attachment for chromosomes Chromosome Centromere Chromatids Metaphase
2nd step in Mitosis

Chromosomes (or pairs of chromosomes) attach to spindle fibers

Line up at the Metapase Plate Telophase
4th Step in Mitosis

Two nuclei form

Chromosomes appear as chromatin (threads rather than rods)

Mitosis ends Prophase
1st Step in Mitosis

Mitosis begins (nucleus begins to divide)

Centrioles appear and begin to move to opposite ends of the cell

Spindle Fibers form between the poles Anaphase
3rd Step in Mitosis

Chromatids separate and begin to move to opposite sides of the cell

Spindle fibers and Centrioles move the Chromatids Cytokinesis
Occurs after Mitosis

Division of cytoplasm

Cell membrane moves inward forming a cleavage furrow (animal cells) or cell plate (plant cells)

Two daughter cells are created each with its own nucleus with identical chromosomes

New cell wall forms in plant cells Cell Cycle

During the cell cycle, a cell grows, prepares for division, and divides to form two daughter cells, each of which then begins the cycle again. When Things Go Wrong

Abnormal growth of cells during mitosis can lead to:
Cancer
Scars cell plate cleavage furrow
Full transcript