MitosisMitosis

MitosisMitosis Four main stagesFour main stages

PMATPMATPProphaserophaseMMetaphaseetaphaseAAnaphasenaphaseTTelophaseelophase

ProphaseProphase 11stst stage of mitosis after Interphase stage of mitosis after Interphase

Nucleolus disappearsNucleolus disappears Nuclear envelope breaks downNuclear envelope breaks down Chromatin condenses into chromosomesChromatin condenses into chromosomes

Chromosomes can be seen as “sister Chromosomes can be seen as “sister chromatids”chromatids”

Mitotic spindles formMitotic spindles form Chromosomes attach to spindlesChromosomes attach to spindles

ProphaseProphase

ProphaseProphase

DRAW IT

MMetaphaseetaphase Chromosomes gather in a plane Chromosomes gather in a plane

across the middle of the cellacross the middle of the cell

MMeet eet MMe in the e in the MMiddleiddle

MetaphaseMetaphase

DRAW IT

AAnaphasenaphase ““Sister” chromatids separate from Sister” chromatids separate from

each othereach other Chromatids move Chromatids move AAway from each other way from each other

towards opposite ends of the celltowards opposite ends of the cell Spindles attached to centrosomes Spindles attached to centrosomes

get shorterget shorter Spindles not attached get longerSpindles not attached get longer

Pushes poles of cell further apartPushes poles of cell further apart

AAnaphasenaphase

AAnaphasenaphase

DRAW IT

TelophaseTelophase Centrosomes reach opposite polesCentrosomes reach opposite poles Spindles disappearSpindles disappear Nuclear envelope and Nucleolus Nuclear envelope and Nucleolus

reappearreappear Chromosomes uncoil and return to Chromosomes uncoil and return to

chromatin statechromatin state

TelophaseTelophase

Cytokinesis

Cytoplasm divides creating two new Cytoplasm divides creating two new cellscells

Original “parent” cell no longer existsOriginal “parent” cell no longer exists

CytokinesisIn animals, it appears as an indentation•Like a draw string around the cell is being tightened

•Water balloon model

In plants, a cell plate forms from within the cell which eventually becomespart of the cell wall

CytokinesisCytokinesis

DRAW ITFor plant &

animal

PracticePractice

InterphaseInterphase

The cell has finished growing and replicating the DNA and is ready to divide.

ProphaseProphase

The Nuclear membrane breaks down and the chromosomes become distinct.

MetaphaseMetaphase

The chromosomes move to the center of the cell with the centromeres in a straight line.

AnaphaseAnaphase

The centromeres split and the chromatids move to opposite ends of the cell.

TelophaseTelophase

The chromatids reach the ends of the cell.

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Put the following slides in Put the following slides in orderorder

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