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http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html
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Interphase
• What the cell spends 90% of its time doing.
• Divided into G1,S, and G2 stages
• This is where the cell goes about basic life functions of growth, DNA copying and regulation
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• During this stage new organelles are being synthesised, so the cell requires both structural proteins and enzymes, resulting in great amount of protein synthesis.
• In short the cell grows (Growth phase)http://en.wikipedia.org/wiki/G2_phase
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• synthesis phase, is a period when DNA synthesis or replication occurs.
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• Cell grows more and prepares to divide
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Cell cycle
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• (The M phase)• Before We Split
mitosis= the division of a cell's nucleus. Along with cytokinesis (the division of the rest of a cell), mitosis results in a parent cell dividing into two daughter cells. The genetic information within each of these daughter cells is identical.
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http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html
This is how we get sister chromatids
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http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html
•Sister chromatids pair up
•Spindle fibers form
•Nuclear envelope breaks down
•Spindle fibers (microtubules) attach
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http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html
•Chromosomes line up in the center of the cell
•½ of each chromosome (1 chromatid) is pulled to each pole of the cell
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http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html
•Nuclear envelope reforms
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Cytokinesis (the final step)
Cytokinesis is the process of splitting the daughter cells apart.
Whereas mitosis is the division of the nucleus, cytokinesis is the splitting of the
cytoplasm and allocation of the golgi, plastids and cytoplasm into each new cell.
http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html
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http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html
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Prophase I
http://www.biology.arizona.edu/CELL_BIO/tutorials/meiosis/page3.html
•Homologous chromosomes pair up (each made up of 2 sister chromatids)
•Homologous chromosomes swap some allele information
•Nuclear envelope disappears
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Metaphase I
http://www.biology.arizona.edu/CELL_BIO/tutorials/meiosis/page3.html
•Chromosomes line up down the middle
•Spindle fibers attach
See information is swapped
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Anaphase I
http://www.biology.arizona.edu/CELL_BIO/tutorials/meiosis/page3.html
•1 of each of the Homologous chromosomes is pulled to each side of the cell
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Telophase I & Cytokinesis
http://www.biology.arizona.edu/CELL_BIO/tutorials/meiosis/page3.html
•The cell divides down the middle
•Nuclear envelope sometimes reforms
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Telophase I & Cytokinesis
http://www.biology.arizona.edu/CELL_BIO/tutorials/meiosis/page3.html
•The cell divides down the middle
•Nuclear envelope sometimes reforms
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No new Interphase!
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Prophase II
•Spindle fibers form
•Nuclear envelope disintegrates
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Metaphase II
•Chromosomes line up in the center of the cell
•Spindle fibers attach
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Anaphase II
•Sister chromatids separate
http://taggart.glg.msu.edu/bs110/meiosis.htm
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Telophase II& Cytokinesis
•Nucleus reforms
•Not that each of the four cells is haploid
http://taggart.glg.msu.edu/bs110/meiosis.htm
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Taken from
• http://biologyinmotion.com/cell_division/index.html
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Comparing the Two
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• Homologous chromosomes swap information in meiosis
• In meiosis 1 homologous chromosomes not sister chromatids are separated
• Meiosis ends with 4 daughter cells, Mitosis ends in 2
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http://www.accessexcellence.org/RC/VL/GG/comparison.html
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