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Cell Cycle & Mitosis

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by

Mr. S. Soderholm

on 30 January 2014

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Transcript of Cell Cycle & Mitosis

Interphase
G2 phase
Mitosis
cytokinesis
prophase
metaphase
anaphase
telophase
G1 phase
S phase
chromatid
chromatid
centro-
mere
Chromosome
chromatin
The Cell Cycle
Cell Growth & Division:
DNA tightly wrapped around proteins
Formed when chromatin condenses during prophase.
Formed by two identical
chromatids
joined by a
centromere
In anaphase, the chromatids are pulled to opposite ends of the cell.
DNA wrapped around proteins
found in the nucleus during interphase
looks like "beads on a string" or spaghetti and meatballs
cell membrane pinches, dividing the cytoplasm
First step after receiving signal to divide
"I look quiet in my interphase."
"In G1, I grow to larger size."
The cell grows larger
"In Synthesis, I double DNA."
DNA is replicated
two copies of DNA; one for each daughter cell.
"G2 decides, and I divide."
DNA replication is checked
DNA errors are repaired
Now all my DNA is tangled chromatin
I enter prophase and start to reel it in.
Condensing X-shaped chromosomes within
Show prophase signs, as I divide.

chromatin condenses to form chromosomes
nuclear envelope dissolves
In my metaphase, the chromosomes
Pulled by spindle fibers find their homes.
Standing across the cell so not one roams,
It’s quite a sight, as I divide.
spindle fibers fully formed
chromosomes align on the equator of the cell
Cell drawings obtained from http://www.edupic.net/cells.htm, January 2014
And now my centromeres will split apart
And chromatids are pulled right from my heart
But Anaphase still leaves my cell unhurt
It’s almost time, I will divide.
each chromatid is pulled by spindle fibers to opposite poles of the cell
each chromosome divides into two identical chromatids
nuclear membranes form at each pole
chromatids begin forming chromatin
And now I need two nuclear membranes.
My old one broke up in prophase.
In telophase two nuclei are formed.
Binucleate, next I divide.
two identical
daughter cells
produced
This cell is crowded and it’s far too large
I pinch the cell membrane, two cells emerge.
Cytokinesis ends my cell growth urge
Daughters abide, and we’ll divide.
Full transcript