Transcript The phases of Mitosis

THE PHASES OF
MITOSIS
Claire Stevens
Interphase– Growth and preparation
The cell is making protein
necessary for its survival
DNA is in its chromatin state
Cell grows bigger
Interphase--Replication
It may not look like anything has
changed in the cell but….
An enzyme
separates the DNA
into two stands here
DNA unwinds
The original DNA strand is a
sort of template for a new
side to form around
Most organelles will be
replicated during this stage
Interphase-Continuing growth and
preparation
The cell is continuing to
grow and make proteins
The chromatin has not coiled
up into chromosomes as of yet
Early prophase
DNA coils up into chromosomes
Spindle fibers start to form from
the centrioles
The nucleolus has disappeared
from the nucleus
The nuclear membrane
begins to break down
Early prophase-continue
The nuclear membrane
continues to break down
The centrioles with the spindle
fibers move towards the poles of
the cell
Early prophase- continue
The centrioles and spindle fibers
are now almost at the poles of
the cell
The cell membrane has almost
completely disintegrated
Late prophase
The centrioles are completely
at the poles
The spindle fibers attach to
the chromosomes at the
centromere
The spindle fibers are now
fully formed.
The nuclear membrane has
completely disappeared
Late prophase- continue
The spindle fibers are starting
to pull the chromosomes into
a line across the equator of the
cell
Late prophase- continue
The chromosomes are
continuing to straighten out
Metaphase
The spindle fibers pull the
chromosomes into a line
across the middle of the cell
Metaphase- continue
The spindle fibers are starting
to retract
The chromosomes are starting
to be pulled apart at the
centromere
Metaphase- continue
The spindle fibers continue
to retract
The centromere is close to
breaking
Anaphase
Spindle fibers are continuing
to retract and pull back
towards the centrioles
Chromosomes break
apart at the centromere
and the sister chromatids
are pull toward opposite
poles of the cell
Anaphase- continue
Spindle fibers are retracting
Sister chromatids are starting to
pull away from the spindle fibers
The cell starting to get
ready to divide
Anaphase- continue
Nuclear membrane starts to form
around each set of sister chromatids
Spindle fibers are almost
completely retracted into the
centriole
Sister chromatids detach from the
spindle fibers and come together with
their partners
Telophase
The nucleolus
reappears within each
nucleus
Set of chromosomes at
each end of the cell
Spindle fibers disappear
A nuclear membrane forms
around the chromosomes
The cell is now ready to divide
Telophase- continue
The cell is getting closer
and closer to division
The chromosomes are starting to
uncoil into chromatin
Telophase- continue
The cell is ready to
split in two
The cell membrane is getting
stronger and more complete
The chromosomes uncoil
further and are now almost
entirely in the chromatin state
Cytokenesis
Two nuclei are moved
into two daughter cells
The two new cells are ready
to go through the life cycle
again!
The two new cells are identical
to the original one
Complete cell
membrane
Chromosomes have
returned entirely to the
state of chromatin
Bibliography
•
http://ineedmoving.com/siteadmin/interphase-cell-diagram
•
http://www.macroevolution.net/prophase-i.html
•
http://www.phschool.com/science/biology_place/biocoach/meiosis/teloi.html
•
http://morganterhune3a.edublogs.org/2011/11/14/cell-cycle-sequencing/
•
http://www.flickr.com/photos/26457459@N02/3264922970/
•
http://seximexibio3.blogspot.ca/
•
http://s322991969.websitehome.co.uk/wsb5822978901/interphase-labeleddiagram
•
http://www.ied.edu.hk/biotech/eng/classrm/class_gene2.html