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