Cell Cell DivisionDivision

Cell Division: MitosisCell Division: Mitosis

• Object: Object:

To study the various stages in To study the various stages in mitotic divisionmitotic division

•In eukaryotes, cell division In eukaryotes, cell division occurs in two major stages.occurs in two major stages.

•The first stage, division of The first stage, division of the cell nucleus, is called the cell nucleus, is called mitosismitosis..

•The second stage, division of The second stage, division of the cell cytoplasm, is called the cell cytoplasm, is called cytokinesiscytokinesis..

Cell Cell DivisionDivision

ChromosoChromosomesmes

•Genetic information is Genetic information is passed from one passed from one generation to the next on generation to the next on chromosomeschromosomes..

•Before cell division, each Before cell division, each chromosome is chromosome is duplicatedduplicated, or , or copiedcopied..

ChromosoChromosomesmes

• Each Each chromosome chromosome consists of two consists of two identical identical “sister” “sister” chromatids.chromatids.

• Each pair of Each pair of chromatids is chromatids is attached at an attached at an area called the area called the centromere.centromere.

Sister chromatids

Centromere

Cell DivisionCell Division

Cell Cell CycleCycle

MitosiMitosiss

• MitosisMitosis– Biologists divide the events of Biologists divide the events of

mitosis into four phases:mitosis into four phases:•ProphaseProphase•MetaphaseMetaphase•AnaphaseAnaphase•TelophaseTelophase

MitosisMitosis

Spindle Spindle formingforming

Chromosomes Chromosomes (paired (paired

chromatids)chromatids)

CentromereCentromere

MitosisMitosis ProphaseProphase

Spindle formingSpindle forming

CentromereCentromereChromosomesChromosomes

(paired chromatids)(paired chromatids)

ProphaseProphase

CentrioleCentriole

CentrioleCentriole

SpindleSpindle

MetaphaseMetaphase

CentrioleCentriole

SpindleSpindle

MetaphaseMetaphase

Individual Individual chromosomeschromosomes

AnaphaseAnaphase

IndividualIndividualchromosomeschromosomes

AnaphaseAnaphase

Nuclear Nuclear envelope envelope reformingreforming

TelophaseTelophase

TelophaseTelophase

CytokinesisCytokinesis

CytokinesisCytokinesis

Cytokinesis in PlantsCytokinesis in Plants

Cell wallCell wallCell plateCell plate

InterphaseInterphase

Animal Cell Plant Cell

ProphaseProphase

Animal Cell Plant Cell

MetaphaseMetaphase

Animal Cell Plant Cell

AnaphaseAnaphase

Animal Cell Plant Cell

TelophaseTelophase

Animal Cell Plant Cell