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Mitosis key terms

Mitosis terms biology101

TermDefinition
Anaphase The fourth stage of mitosis during which sister chromosomes are separated and pulled to opposite ends of the cell by kinetochore microtubules.
Contractile ring A ring of protein filaments that encircles the region of the metaphase plate in a dividing cell. Responsible for pinching the cell until it separates into two independent cells.
Cytokinesis The final part of M Phase, during which a cell with duplicated contents splits into two independent cells.
Kinetochores Sites on replicated, bound sister chromatids to which microtubules bind, thereby becoming kinetochore microtubules.
M phase The name given to the five separate steps of mitosis and the final cleavage of the cell in cytokinesis.
Metaphase The third stage of mitosis during which kinetochore microtubules* align sister chromatids along the metaphase plate at the center of the cell.
Metaphase plate An imaginary line found half way between the two mitotic spindle poles on which chromosomes align during metaphase.
Microtubule In cytoskeleton/ cylindrical-approx25 nanometers in diam/ organelles can travel within the cell on tracks/ Kinetocore(bind to sister chromatids during mitosis)& Non-kinetocore(polar/ astral)
Mitosis The five-step process by which a cell separates replicated chromosomes before cytokinesis creates two identical daughter cells from one original cell. The five steps of mitosis are: prophase, prometaphase, metaphase, anaphase, telophase.
Mitotic spindle A complex of microtubules that form between opposite poles of a cell during mitosis. Serve to separate and move sister chromatids to opposite ends of the cell for division.
Prometaphase The second stage of mitosis during which the nuclear envelope disassembles and microtubules gain access to chromosome kinetochores.
Prophase The first stage of mitosis, during which visibly dark, condensed chromosomes are found in the nuclear envelope.
Telophase The fifth and final stage of mitosis before cytokinesis; in telophase, the nuclear envelope re-forms around separated sister chromatids and kinetochore microtubules disappear. Cell elongation and decondensation of chromosomes also occur.
Created by: vcopeland
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