Mitosis Review SBI 3 U Mitosis The Cell
Mitosis Review SBI 3 U
Mitosis
The Cell Cycle • All phases except mitosis are considered part of Interphase
The Chromosome • During interphase, the chromosomes exist as chromatin (stringy mass) • Each chromosome is duplicated during interphase • The original chromosome is attached with a centromere to its sister chromatid
Stages of Mitosis • Prophase – Chromosomes become visible as they shorten and thicken – In animal cells, structures called centrioles move to opposite ends of the cell and provide attachment for spindle fibres – Nuclear membrane begins to disappear.
Stages of Mitosis cont. • Metaphase – Sister chromatids move toward the equatorial plate – Spindle fibres are attached to centromeres
Stages of Mitosis cont. • Anaphase – Centromeres divide and the chromatids, now daughter chromosomes, move to opposite poles
Stages of Mitosis cont. • Telophase – Chromosomes lengthen – Spindle fibres dissolve – Nuclear membrane forms around each set of chromatin – Followed by cytokinesis (division of cytoplasm)
Cytokinesis • In animal cells – Cleavage furrow develops, pinching off the cell into two • In plant cells – Cell plate forms into a new cell wall
Animations • http: //www. sumanasinc. com/webcontent/a nimations/content/mitosis. html • http: //www. johnkyrk. com/mitosis. html
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