Download Cell Cycle Cornell Notes What happens in the cell cycle? Interphase

Cell Cycle Cornell Notes
What happens in the cell cycle?
p. 73
1/7/13
Interphase
interphase is actually made up of
3 parts
G1 = cell is growing and doing its
normal job
S = DNA and centrioles replicate
G2 = cell is growing and getting
ready to divide
*part of the cell cycle, but not mitosis
Jan 7­9:01 AM
Cell Cycle Cornell Notes
What happens in the cell cycle?
p. 73
1/7/13
Prophase
DNA packs together to form chromosomes
(chromosomes are X shaped)
nuclear membrane disappears or dissolves
centrioles move to opposite ends of the cell
*first step of mitosis
Jan 7­9:01 AM
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Cell Cycle Cornell Notes
What happens in the cell cycle?
p. 73
1/7/13
Metaphase
chromosomes line up in the center of the
cell (along the equator of the cell)
spindle fibers attach to the chromosomes at
the centromere
*second step of mitosis
Jan 7­9:01 AM
Cell Cycle Cornell Notes
What happens in the cell cycle?
p. 73
1/7/13
Anaphase
chromatids are pulled apart to opposite
ends of the cell
1/2 of a chromosome is called a chromatid
*third step of mitosis
Jan 7­9:01 AM
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Cell Cycle Cornell Notes
What happens in the cell cycle?
p. 73
1/7/13
Telophase
new nuclear membranes form
DNA stretches out
cell membrane and cytoplasm begin to pinch
together
*fourth (final) step of mitosis
Jan 7­9:01 AM
Cell Cycle Cornell Notes
What happens in the cell cycle?
p. 73
1/7/13
Cytokinesis
cell membrane and cytoplasm pinch together
cell completely splits to form two identical
daughter cells
*part of the cell cycle, but not mitosis
Jan 7­9:01 AM
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Cell Cycle Cornell Notes
What happens in the cell cycle?
p. 73
1/7/13
Why do cells divide?
to help the body grow
to replace old and dying cells - to keep the
body healthy
What is the purpose of mitosis?
to separate the two copies of DNA so that
both daughter cells have a complete
copy of identical DNA
Jan 7­9:01 AM
Practice cell cycle control:
http://www.nobelprize.org/educational/medicine/2001/cellcycle.html
Jan 7­9:28 AM
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Practice identifying the steps of the cell cycle:
http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cycle.html
Jan 7­9:28 AM
More cell cycle practice:
http://app.discoveryeducation.com/player/?assetGuid=1cfccb34-38e6-43bc-8d66-70941bafcc2b&fromMyDe=0
&isPrinterFriendly=0&provider=&isLessonFromHealth=0
&productcode=DSC&isAssigned=false&includeHeader=YES&homeworkGuid=
Jan 7­9:33 AM
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http://teachertube.com/viewVideo.php?video_id=81750
#sthash.TA60TS0W.dpuf
Jan 7­10:11 AM
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