Mitosis.ppt
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Transcript of Mitosis.ppt
-genetic material (blueprints)
• Long strands:
Chromatin
(spaghetti)
• CHROMOSOMES: Condensed strands,macaroni
• CHROMATIDS:Duplicated Chromosomes, double macaroni
MITOSIS Division of the cell to make
new cells. Three stages of cell division:
Interphase- whole cell
Mitosis- nucleus only (4 steps)
Cytokinesis-whole cell
INTERPHASE Whole cell-organelles 2x,
DNA replicates,
prep.
Most of the cell’s life is spent in interphase.
INTERPHASE
MITOSIS4 PHASES/STEPSNUCLEUS ONLY
PROPHASE• Nuclear
membrane disappears.
• Centrioles move to opposite sides of cell.
• Chromosomes 2x.
PROPHASE
PROPHASE
METAPHASE• Chromatids
attach to
spindle fibers
and line up in
center of cell.
METAPHASE
MILITARY LINE-UP
METAPHASE
ANAPHASE• Chromatids
go to
opposite
sides of
the cell.
ANAPHASE
AWAY
ANAPHASE
TELOPHASE• New nuclear
membrane
surrounds
Chromosomes,
which return
to chromatin.
TELOPHASE
TWO NUCLEI
TELOPHASE
SAME TIME AS CYTOKINESIS
CYTOKINESIS• Whole cell• Same time as Telophase
• Chromatin again
CYTOKINESISDifference
between
P & A: Animal pinches in
&…..
CYTOKINESISDifference
between
P & A:
Plant has cell plate moving out.
CYTOKINESIS
2 CELLS
WHOLE PROCESS:
CREATION OF 2 NEW IDENTICAL CELLS