Mitosis is cell division in somatic cells

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Presentation transcript:

Mitosis is cell division in somatic cells Mitosis is cell division in somatic cells. Somatic cells = All the cells in your body that are not sex cells (eggs and sperm) Mitosis

Why? Unicellular organisms use it to reproduce. Mitosis

Why? Multicellular organisms use it for growth

Why? Multicellular organisms use it to repair tissues

Muscle and Nerve tissues do not normally do mitosis. Eric LeGrand – Rutgers

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Cancer is uncontrolled mitosis with no differentiation. Licentious division - prostate cancer cells during division.

A cell’s life:

DNA is Packaged into Chromosomes chromatin duplicated chromosome The packaging is impressive – 2 meters of human DNA fit into a sphere about 0.000005 meters in diameter.

Genes, Mitosis and Cytokinesis 4/25/2017 DNA replication: It happens during INTERPHASE. G. Podgorski, Biol. 1010

The Link Between DNA Replication and Chromosome Duplication

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.

During Mitosis Chromosomes divide. Cytokinesis occurs

There are 4 steps, or phases of mitosis: Prophase Metaphase Anaphase Telophase

replication is completed. interphase prophase metaphase Interphase – DNA replication is completed. Prophase – Chromosomes shorten and thicken, centrioles appear, nuclear membrane disintegrates. Metaphase – chromosomes line up on equatorial plate in middle of cell.

Genes, Mitosis and Cytokinesis 4/25/2017 Anaphase – chromatids are pulled apart, chromosomes pulled to opposite sides of the cell Telophase – Cytokinesis occurs, cell returns to normal. G. Podgorski, Biol. 1010

Mitosis in Action Blue shows DNA, green shows spindle fibers.

In Animal Cells, a Cleavage Furrow Forms and Separates Daughter Cells during cytokinesis. Cleave furrow in a dividing frog cell.

A cell plate forms between two plant cells to separate them.

http://www.youtube.com/watch?v=VlN7K1- 9QB0