Cell Division Mitosis YouTube Lecture Handouts

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Cell Division Mitosis YouTube Lecture Handouts

Mitosis & Amitosis

Cell Division Mitosis and Amitosis of Image - 1

Amitosis

  • Direct cell division
  • By Remak & explained by Flemming
  • No chr. differentiation & spindle
  • Nuclei elongate, constrict & forms two daughter cells
  • Common in diseased cells
  • E. g. , Monera
  • Others are indirect cell division
Showing Cells Dividing in Mitosis

Mitosis

  • Direct cell division
  • By Remak & explained by Flemming
  • No chr. differentiation & spindle
  • Nuclei elongate, constrict & forms two daughter cells
  • Common in diseased cells
  • E. g. , Monera
  • Others are indirect cell division
Cell Division Mitosis Image - 3
Cell Division Plant Mitosis and Animal Mitosis Table - 1
Plant MitosisAnimal Mitosis
In meristemIn many places
By cytokininBy lymphokines, epidermal growth factors
No change in shapeBecomes spherical
Spindle – An astralSpindle - Amphiastral
Centriole is absentSpindle pole possess centriole
Equatorial region forms phragmoplastEquatorial region forms midbody
Cytokinesis by cell plateBy cleavage
Cell plate grow centrifugallyGrows centripetally
Microfilament not importantImportant role
Cell plate cements daughter cellsCleavage creates intracellular space between daughter cells

Significance of Mitosis

  • Growth
  • Maintenance of surface-volume ratio
  • Maintenance of chromosome number
  • Regeneration
  • Reproduction and repair
  • Differentiation
  • Cancer – uncontrolled mitotic division

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