mitosis is cell division in somatic cells. somatic cells = all the cells in your body that are not...
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Mitosis is cell division in somatic cells.
Somatic cells = All the cells in your body that are not sex cells (eggs and sperm)
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*Why?
*Unicellular organisms use it to reproduce.
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*Why? Multicellular organisms use it for
growth
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*Why?
Multicellular organisms use it to repair tissues
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*Muscle and Nerve tissues do not normally do mitosis.
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*Stem cells are cells that do mitosis, then the daughter cells undergo differentiation to become a specific type of cell in the multicellular organism.
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Licentious division - prostate cancer cells during division.
Cancer is uncontrolled mitosis with no differentiation.
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A cell’s life:
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DNA is Packaged into Chromosomes
The packaging is impressive – 2 meters of human DNA fit into a sphere about 0.000005 meters in diameter.
chromatin
duplicatedchromosome
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DNA replication:
It happens during INTERPHASE.
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The Link Between DNA Replication and Chromosome Duplication
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DNA is Condensed into Visible Chromosomes Only For Brief Periods in the Life of a Cell
95% of the time, DNA is like this.
CHROMATIN
SISTER CHROMATIDS: Duplicate chromosomes bound together by a centromere.
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Chromosomes divide.
Cytokinesis occurs
During Mitosis
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1.Prophase
2.Metaphase
3.Anaphase
4.Telophase
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Prophase – Chromosomes shorten and thicken, centrioles appear, nuclear membrane disintegrates.Metaphase – chromosomes line up on equatorial plate in middle of cell.
interphase
prophase metaphase
Interphase – DNA replication is completed.
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Anaphase – chromatids are pulledapart, chromosomes pulled to opposite sides of the cell
Telophase – Cytokinesisoccurs, cell returns to normal.
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Mitosis in Action
Blue shows DNA, green shows spindle fibers.
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In Animal Cells, a Cleavage Furrow Forms and Separates Daughter Cells during cytokinesis.
Cleave furrow in a dividing frog cell.
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A cell plate forms between two plant cells to separate them.
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*http://www.youtube.com/watch?v=VlN7K1-9QB0