The Cell Cycle

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Binary Fission: • Cell Division in Prokaryotic Cells • asexual reproduction in which one cell divides into two identical daughter cells

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The Cell Cycle. How cells divide to make new cells. Just like people have phases of development,. Cells have phases too. In somatic (body) cells, a parent cell produces 2 daughter cells. The purpose of cell division is for growth and repair of tissue. Three Phases or Stages. Interphase - PowerPoint PPT Presentation

Transcript of The Cell Cycle

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Binary Fission:• Cell Division in Prokaryotic Cells• asexual reproduction in which one cell divides

into two identical daughter cells

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The Cell Cycle

How cells divide to make new cells

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Just like people have phases of development,

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Cells have phases too.

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In somatic (body) cells, a parent cell

produces 2 daughter cells.

The purpose of cell division is for growth and repair

of tissue.

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Three Phases or Stages

1. Interphase2. Mitosis3. Cytokinesis

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Interphase

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Interphase DNA and organelles replicate Cell spends most of its life in

this stage

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Stages of InterphaseG1 (growth) normal activities – endo & exo

S (synthesis) genetic material is duplicated so each daughter cell contains the same amount of genetic material as the parent cell

G2 (growth) preparing for cell division

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Mitosis

Nucleus divides Duplicated DNA is divided

into two new nuclei

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Stages of Mitosis

ProphaseMetaphaseAnaphaseTelophase

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Prophase

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Prophase

• Nuclear membrane breaks down• Genetic material (chromatin)

condenses• Centrioles migrate to opposite

ends of poles (in animal cells)•Microtubules (spindle fibers)

attach to centrioles

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Prophase

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Metaphase

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Metaphase

• Duplicated chromosomes line up on the equator of the cell

• Microtubules (spindle fibers) attach to centromere at kinetochore

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Metaphase

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Anaphase

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Anaphase

• Duplicated chromosomes (also called sister chromotids) separate

• 1 of each pair are pulled apart toward opposite poles of the cell

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Anaphase

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Telophase

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Telophase

• New nuclear membranes form to separate the genetic material

• Cleavage furrow in animal cells

• Cell plate in plant cells

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Telophase

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Mitosis

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Cytokinesis

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Cytokinesis

• Occurs AFTER telophase and BEFORE interphase

• Cytoplasm divides

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Cytokinesis

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Mitosis Animation

http://www.cellsalive.com/mitosis.htm
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What happens when cells divide at an uncontrollable rate?

CANCER

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Causes of Cancer

• Tobacco•Radiation exposure•Viral infections (HPV)•Genetics

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Cancer Animation

http://www.youtube.com/watch?v=IeUANxFVXKc

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