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K. York
Mitosis
10
Science
7th Grade
01/28/2010

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Term
Cell Division
Definition
the formation of two daughter cells from a single parent cell.
Term
Centriole
Definition
a cylindrical organelle in animal cells that is involved in cell division. Centrioles form spindle fibers which separate chromosones during cell division.
Term
centromere
Definition
the part of chomosome where the chromatids are attached .during mitosis, spindle fibers attach to the chromosomes at the centromere
during mitosis, spindle fibers
Term
chromatid
Definition
one of two identical halves of a relicated chromosome
Term
chromatin
Definition
DNA strands during interphase
chromatin stains dark making it relatively east to see (the greek root "chroma" mans color)
Term
chromosome
Definition
a structure formed from condensed chormatin.
chromosomes consits of two identical chromaitds attached at the centromere, giving them a characteristic "X" shape.

chromosomes occur in pairs. human cells have 23 pairs of chromosomes, or 46 total chromosomes
Term
cytokinesis
Definition
the division of the cytoplasm of the cell to form two daughter cells.
Term
DNA
Definition
a molecule that carries genetic information

DNA stands for deoxtribonucleic acid
Term
interphase
Definition
the period in the cell cycle during wich the cell grows, matures, and duplicates genetic information
Term
mitosis
Definition
the equal divisions of the cromosomes into geneticically identical daughter nuclei. mitosis consists of four stages.

during prophase, chromosomes form from condensed chromatain

during metaphase, the chromosomes line up along the center axis of the cell.

During anaphase, the chromosomes split up and chromatids are pulled to opposite ends of the cell.

During telophase, a new nuclear membrane forms around each set of chromatids.
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