Download - Cell cycle for moodle
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10-2 Cell Cycle
G1 Phase
S Phase
G2 Phase
M Phase
Interphase – G1- cell grows, normal
functions of life– S Phase – DNA
replicates
– G2- cell grows and prepares for mitosis
M Phase – Mitosis– Cell division
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Chromosomes
In Interphase, chromosomes appear as chromatin
When mitosis begins, chromatin condenses to form visible chromosomesSister chromatids are identical halves of a duplicated chromosome• Chromatids are joined at the
centromere
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Mitosis - Prophase
Chromosomes condenseNuclear membrane disappearsSpindle fibers form as centrioles move toward poles
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Mitosis - Metaphase
Chromosomes line up along the cell’s center Chromosomes attach to spindle fibers at the centromeres
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Mitosis - Anaphase
Sister chromatids separate and move toward poles
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Mitosis – Telophase and Cytokinesis
Telophase – last step of mitosis– Individual chromosomes gather
at poles– Nuclear membrane reforms
Cytokinesis – follows telophase– Cell pinches in half– Two cells form
• Animal Cells – cleavage furrow• Plant Cells – cell plate
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Mitosis in Plant vs. Animal Cells
Plant Cells Animal Cells
SpindleFibers
Stages of mitosis (PMAT)
No centrioles
Cell plate forms
between cells
Cell pinches at cleavage
furrow
Centrioles
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Another Look at Mitosis
Onion Cells
Mitosis in a Lily Cell
Mitosis in Whitefish Cells
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Mitosis Review
How many chromosomes did this cell start with?– FOUR
During which phase are sister chromatids separated?– ANAPHASE
How many chromosomes are in EACH daughter cell?– FOUR