Just like people have phases of development Cells have phases too In somatic body cells a parent cell produces 2 daughter cells The purpose of mitosis is for growth and repair of tissue Three Phases or Stages ID: 637631
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Slide1
The Cell Cycle5A
How eukaryotic cells divide to make new cellsSlide2
Just like people have phases of development,Slide3
Cells have phases too.Slide4
In somatic (body) cells, a parent cell produces 2 daughter cells.The purpose of mitosis is for growth and repair of tissue.Slide5
Three Phases or Stages
Interphase M (Mitosis) phaseCytokinesisSlide6
InterphaseSlide7
Interphase
DNA
and organelles replicate
Cell
spends most of its life in this stageSlide8Slide9
Stages of Interphase
G1 (growth) S (synthesis) G2 (growth)
Slide10
G1 (growth)
Aka First GapThe cell grow largerMakes proteins and organellesSlide11
S (synthesis)
DNA replication occurs - genetic material is duplicated so each daughter cell
contains the same
amount
of genetic material as the parent cell
Chromosomes duplicate to form sister chromatidsSlide12Slide13Slide14
G2 (growth)
Aka Second GapMore growth & protein synthesis occurspreparing
for cell divisionSlide15Slide16
M phase
Aka Mitosis Shortest of all phases
Division of the nucleusSlide17
Mitosis
Nucleus divides
Duplicated
DNA is divided into two new nucleiSlide18Slide19
Mitosis AnimationSlide20
Stages of Mitosis
ProphaseMetaphaseAnaphaseTelophaseSlide21
ProphaseSlide22
Prophase
Nuclear membrane breaks downGenetic material (chromosomes) enlarges, thickens &condenses
In the cytoplasm, Centrioles migrate to opposite ends of poles
Microtubules attach to centriolesSlide23
ProphaseSlide24
MetaphaseSlide25
Metaphase
Duplicated chromosomes line up on the equator of the cellSpindles attach to chromosomes at the centromere & pull the sister chromatids into a line in the center of the cellSlide26
MetaphaseSlide27
AnaphaseSlide28
Anaphase
Shortest phaseAs the spindle contracts, the sister chromatids separate and are pulled to opposite sides of the cellSlide29
AnaphaseSlide30
TelophaseSlide31
Telophase
New nuclear membranes form to separate the genetic materialChromosomes shrink
Spindle breaks apartSlide32
TelophaseSlide33
MitosisSlide34
CytokinesisSlide35
Cytokinesis
Occurs AFTER telophase and BEFORE interphase
Cytoplasm divides
Forms 2 new cellsSlide36
CytokinesisSlide37Slide38Slide39
http://outreach.mcb.harvard.edu/animations/cellcycle.swfSlide40Slide41
Identify the stage of the cell cycle…Slide42
Identify the stage of the cell cycle…Slide43
Identify the stage of the cell cycle…Slide44
Identify the stage of the cell cycle…Slide45
http://bio.rutgers.edu/~gb101/lab2_mitosis/index2.htmlSlide46
What happens when cells divide at an uncontrollable rate?
CANCER5DSlide47Slide48
Cancer AnimationSlide49Slide50Slide51Slide52
Cancer is caused by the loss of cell’s ability to control division. Cancer cells divide uncontrollably.Slide53
Causes of Cancer
TobaccoRadiation exposure
Viral infections (HPV)
GeneticsSlide54
http://www.mhhe.com/biosci/genbio/virtual_labs/BL_23/BL_23.html