MitosisClick on the hyperlink above to watch a tutorial of
the cell cycle
Critical Check Points in the Cell Cycle
Chromosome Duplication Kinetochore
The Phases
Interphase
TelophaseAnaphase
Metaphase
Prometaphase
Prophase
Cytokinesis
Mitosis Tutorial
Click on the hyperlink above- Watch the narration of mitosis- Complete the step through version of mitosis- Complete the quiz after the tutorial
Interphase• period of cell growth and metabolic activity• DNA is duplicated, but exists as chromatin• organelles have been replicated• G1, S, and G2 subphases
Prophase• chromatin condenses and forms chromosomes• mitotic spindle (microtubules) forms from
centrosomes• centrosomes contain centrioles in animal cells
Interphase
Prophase
Prometaphase
• nuclear envelope breaks down• spindle fibers attach to chromosomes at a
structure called a kinetochore- protein structure that assembles the
centromere• spindle fibers begin to move chromosomes
Metaphase
• chromosomes have been aligned in the middle of the cell (metaphase plate)
• centromeres are lined up Metaphase
Anaphase
• sister chromatids of each chromosome are separated
• spindle fibers pull the sister chromatids apart• some spindle fibers act to elongate the cell
Anaphase
Telophase• cell elongation continues• nuclear envelopes reform around each set of
chromosomes• chromosomes uncoil• mitotic spindle disappears
Cytokinesis• division of the cytoplasm• two genetically identical daughter cells are
formed• resulting daughter cells are diploid
Animal and Plant Cell Mitosis
Animal Cell• have centrosomes and
centrioles which generate the mitotic spindle
• cell membrane pinches inward during cytokinesis dividing the two cells (cleavage furrow)
Animal and Plant Cell Mitosis
• only have centrosomes
• cell plate forms during cytokinesis
• vesicles carrying cell membrane and wall components are transported to the midline
- vesicles fuse forming the new cell membrane and
wall
Plant Cell
Cell Plate Formation