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Prophase

Metaphase. Prophase. Works Cited. Mitosis. Definitions. Telophase. Anaphase. Prophase(prophase and Prometaphase). Back. Prophase 1 st step of Mitosis Chromatin condenses into chromosomes

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Prophase

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  1. Metaphase Prophase Works Cited Mitosis Definitions Telophase Anaphase

  2. Prophase(prophase and Prometaphase) Back • Prophase • 1st step of Mitosis • Chromatin condenses into chromosomes • Two chromosomes are created, thanks to the genetic material created in the “S” step of the Cell Cycle • Prometaphase • Microtubules enter the nuclear space • Each chromosome forms 2 kinetochores at the centromere

  3. Metaphase Back • Centromeres of opposing chromatids meet at the metaphase plate • In some types of cells chromosomes do not line up at the metaphase plate, rather they hover back and forth between poles randomly. • If a kinetochore becomes unattached from its microtubules, it will generate a signal, preventing a premature leap to anaphase (the mitotic spindle checkpoint)

  4. Anaphase Back • The proteins holding together the sister chromatids are broken down, separating them. • The new chromosomes are then pulled apart by shortening kinetochores to their respective sides.

  5. Telophase Back • Essentially a reversal of prophase/prometaphase. • The newly separated chromosomes fuse with opposite ends of the cell. • Using pieces of the parent cell’s membrane, a new nuclear membrane is created around the chromosomes • The newly created nuclei now unfold back into chromatin.

  6. Definitions Home • Kinetochores – the protein structure on chromosomes where spindle fibers attach during division to pull chromosomes apart. • Metaphase Plate – an imaginary line on the chromatid that is equidistant from the two centrsome poles • Mitotic Spindle Checkpoint – the point at which a cell undergoing mitosis stops so that kinetochores may attach completely before continuing to anaphase.

  7. Click on a picture from the right to learn about thephase. Works Cited Home Prophase, Metaphase, and Anaphase in an animal cell.

  8. Works Cited Home • http://www.accessexcellence.org/RC/VL/GG/images/MITOSIS2.gif • http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/Bio%20101/Bio%20101%20Laboratory/Mitosis/mitosis.htm • http://www.mhhe.com/biosci/pae/botany/botany_map/articles/images/bm_05-03.gif Plant cell mitosis

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