cell division mitosis. what is mitosis? part of eukaryotic cell division during which the cell...
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CELL DIVISION
Mitosis
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WHAT IS MITOSIS?
Part of eukaryotic cell division during
which the cell nucleus divides.
Results in the formation of 2 identical
daughter cells.
Mitosis is completed in 4 distinct
steps.
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THE CELL CYCLE
Mitosis takes up
very little of the life
time of a cell.
90% of the time our
cells are in between
cell divisions.
We call this in
between time
INTERPHASE.
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INTERPHASE
There are 3 phases of interphase in which the cell is
carrying out different functions.
• G1: First phase of interphase in which a cell does most of its growing. They increase in size and synthesize new proteins and organelles.
• S: The second phase of interphase. Chromosomes are replicated and the synthesis of DNA molecules takes place.
• G2: Third phase of interphase. The cell prepares itself for mitosis.
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PHASES OF MITOSIS
Biologists divide the events of mitosis into
four phases: Prophase, metaphase, anaphase,
and telophase.
IPMAT. IPMAT?
An easy device to help remember the steps of
the cell cycle in the correct order. Interphase,
Prophase, Metaphase, Anaphase, Telophase.
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PROPHASE
First and longest stage
of mitosis, during which
the chromosomes
become visible and the
centrioles separate and
take up positions of the
opposite sides of the
nucleus.
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PROPHASE (CONT.)
The nuclear membrane
and nucleolus disappear
during prophase. The
spindle fibers begin to
form and attach
themselves to the
centromeres of the
chromosomes
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METAPHASE
Second phase of mitosis,
during which the
chromosomes line up across
the center of the cell.
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ANAPHASE
Third phase of
mitosis, during
which the
chromosome
pairs separate
and move
toward opposite
poles.
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TELOPHASE
Fourth and final
phase of mitosis,
during which the
chromosomes begin
to unravel back into
chromatin.
The nuclear
membrane and
nucleolus reform.
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CYTOKINESIS
Cytokinesis, while technically
not a part of mitosis, results in
the physical splitting of the
cytoplasm.
The sides of the cell membrance
pinch inwards creating a
cleavage furrow.
Afterwards, the two new
daughter cells will enter the G1
phase of interphase.