Cell Division Mitosis YouTube Lecture Handouts
Doorsteptutor material for competitive exams is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of your exam.
Get video tutorial on: Examrace YouTube Channel
Cell Division Mitosis YouTube Lecture Handouts
Mitosis & Amitosis
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
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
Plant Mitosis | Animal Mitosis |
---|---|
In meristem | In many places |
By cytokinin | By lymphokines, epidermal growth factors |
No change in shape | Becomes spherical |
Spindle – An astral | Spindle - Amphiastral |
Centriole is absent | Spindle pole possess centriole |
Equatorial region forms phragmoplast | Equatorial region forms midbody |
Cytokinesis by cell plate | By cleavage |
Cell plate grow centrifugally | Grows centripetally |
Microfilament not important | Important role |
Cell plate cements daughter cells | Cleavage 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
✍ Manishika