Mitosis
Cell Reproduction
HOW DOES AN ORGANISM GROW?
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HOW DOES AN ORGANISM GET BIGGER?
Mitosis Notes
Asexual Reproduction – offspring are produced that are genetically identical to the parent
Mitosis – the asexual reproduction process of cell division
Interphase
What happens?
Chromosomes are present but not visible
DNA replicates How the cell normally
looks
INTERPHASE
When the cell performs its function (example: muscle cells contract and expand during interphase to help you move)
Cell gets bigger (makes more cytoplasm and organelles) Cell copies DNA
Part of mitosis?
Interphase is part of the cell’s life cycle; but it is NOT a stage of mitosis
Prophase
What happens?
Nuclear membrane disappears
Chromosomes appear Centrioles begin to
move
PROPHASE
DNA (which was loose in nucleus) gets tightly wound into chromosomes
Nucleus dissolves
Metaphase
What happens?
Spindle fibers line the chromosomes up in the middle of the cell
METAPHASE
Chromosomes line up in the center of the cell Spindle fibers attach to each chromosome
Anaphase
What happens?
The spindle fibers pull the chromosomes apart at the middle
ANAPHASE
Chromosomes are pulled to opposite ends of the cell
Telophase
What happens?
Nuclear membrane reappears
Chromosomes disappear
The cell begins to be pinched in the middle
TELOPHASE
A new nucleus forms around each set of chromosomes. This produces one cell with two nuclei
Cytokinesis
What happens?
The cell is pinched in half Two identical cells are
made
CYTOKINESIS
A new cell membrane (and cell wall in plants) is created between the two new cells.
TWO IDENTICAL CELLS ARE FORMED
The Phases of Mitosis
Interphase
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
5. Cytokinesis
Mnemonic Device
P lease
M eet
A t
T he
C ircus
Mitosis Notes
During cell division …
It is essential that the DNA is replicated The number of chromosomes NEVER
changes Each daughter cell gets its own copy of the
DNA
http://www.cellsalive.com/mitosis.htm
http://www.cellsalive.com/cell_cycle.htm
Using the textbook define the following terms
Mitosis Cytokinesis Centromeres Interphase Cell cycle Spindle