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H. Shows
Mitosis
10
Science
7th Grade
01/28/2010

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Term
Cell Division
Definition
The formation of two daughter cell from a single parent cell.
Term
Centriole
Definition
A cylindrical organelle in animal cells that is involved in cell divison.
Centrioles form spindle fibers which separate chromosomes during cell divison.
Term
Centromere
Definition
The part of a chromosome where the chromatids are attached.
During mitosis, spindle fibers attach to the chromosome at the centromere.
Term
Chromatid
Definition
One of two identical halves of a replicated chromosome.
Term
Chromatin
Definition
DNA strands in the nucleus during interphase.
Chromatin stains dark, making it relatively easy to see. (the Greek root "chroma" means color)
Term
chromosome
Definition
A structure formed from condensed chromatin.
Chromosomes consist of two identical chromatids attached at the centromere, giving them a characterisic X shape.
Chromosomes occur in pairs. Human cells have 23 pairs of chromosomes,or 46 total chromosomes.
Term
Cytokinesis
Definition
The divison of the cyto plasm of the cell to form two daughter cells.
Term
DNA
Definition
A molecule that carries genetic information.
DNA stands for deoxyribonucleic acid.
Term
Interphase
Definition
The peirod in the cell cycle during which the cell grows, matures, and duplicates genetic information.
Term
Mitosis
Definition
The equal division of the chromosomes into two gentically identical daughter nuclei. Mitosis consits of four stages.
During prophase, chromosomes form condensed chromatin.
During metaphase, the chromosmes lin up along the center axis of the cell.
During anaphase,the chromosomes split up and chromatids are pulled to opposite end of the cell.
During telophase, a new nuclear membrane forms around each set of chromatids.
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