pö ÿalima 02-26-10 cell division you will need your computer today
TRANSCRIPT
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Pö ÿalima 02-26-10
Cell Division
You will need your computer today
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10.2 Goals
I will be able to explain what happens in the cell cycle.
I will be able to explain and identify the stages of mitosis.
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Mitosis10.2
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Cell cycle = Life span of the cell
G1 phase – cell grows, makes more organelles and proteins
S phase – chromosome replication (S = synthesis = “to make”)
S phase
G1 phase
G2 phase
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Chromosomes and Chromatid
Each chromosome made of two identical chromatids.
Attached together by the centromere
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Cell cycle = Life span of the cell
G1 phase – cell grows, makes more organelles and proteins
S phase – chromosome replication (S = synthesis = “to make”)
G2 phase – molecules and organelles required for cell division produced
M phase – mitosis and cytokinesis
Interphase – G1, S, G2
S phase
G1 phase
G2 phase
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CELL DIVISION
Eukaryotes (cells with a nucleus) go through 2 stages of division Mitosis – division of the nucleus Cytokinesis – division of the
cytoplasm
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MITOSIS
4 phases of nuclear division
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Prophase Longest phase of
mitosis Chromosomes become
visible Centriole pairs begin
to separate Spindle fiber forms
(made of microtubules)
Nuclear envelope breaks down
Spindle begins to attach to chromosomes at the centromere
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Metaphase
Chromosomes line up across center of the cell (“equator” or “metaphase plate”)
Centriole pairs at opposite ends of the cell
Centromere connected to the spindle fibers
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Anaphase
Sister chromatid split apart
Chromosomes get pulled to opposite poles by the shrinking spindle fibers
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Telophase Chromosomes
decondense
Nuclear envelope reforms around each set of chromosomes at opposite ends of the cell
2 nuclei are formed
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Cytokinesis
Division of the cytoplasm
2 new daughter cells are formed with the same number of chromosomes as the original cell.
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Video of Mitosis http://highered.mcgraw-hill.com/sites/0072437316/stu
dent_view0/chapter11/animations.html#
http://www.youtube.com/watch?v=s1ylUTbXyWU&feature=related
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Name the stages…
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Try This Virtual Lab
http://bio.rutgers.edu/~gb101/lab2_mitosis/section1_frames.html
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Homework Online Mitosis W/S
Mitosis Flipbook. Include:
Interphase, pro-, meta-, ana-, telo-, cytokinesis
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Homework Pg. 249 #1-6
Pg. 257 #13-14