Download Mitosis DU

Mitosis
Cell Reproduction
HOW DOES AN ORGANISM
GROW?
HOW DOES AN ORGANISM GET
BIGGER?
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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.
2.
3.
4.
5.
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
Mnemonic Device
P lease
M eet
At
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