biology

1. Unit 1: Cell Biology
Topic: 1.6 Cell Division
Class: 10 B
Lesson: Biology
Duration: 60 min
________________________
Büşra Acaroğlu
07.10.2020

2. Essential Idea: Cell division is essential but must be controlled

4. Why do cells divide?
• Remember large cells have a reduced SA:Vol ratio  less effcient than small cells
(The rate of metabolism of a cell is a function of its mass / volume (larger cells need more energy to sustain essential
functions)
The rate of material exchange is a function of its surface area (large membrane surface equates to more material
movement)
needs to produce more cells, each of them needs copy of the organism’s DNA
Cell division:
• more growth
• more differentiation
• new cells for replacement (death, damaged or infected cells)

5.  new cells are always necessary, so there is always need for MİTOSİS

6. Diploid cells have two homologous copies of
each chromosome, usually one from
the mother and one from the father

8. https://www.wisc-online.com/learn/natural-science/life-science/ap13604/the-cell-cycle

10. Interphase is a very active phase of the cell cycle with many processes occurring in
the nucleus and cytoplasm

11. Interphase is a very active phase of the cell cycle with many processes occurring in
the nucleus and cytoplasm

12. Mitosis is division of the nucleus into two genetically identical daughter nuclei

14. Mitosis is division of the nucleus into two genetically identical daughter nuclei

15. Mitosis is division of the nucleus into two genetically identical daughter nuclei

16. Mitosis is division of the nucleus into two genetically identical daughter nuclei

17. Mitosis is division of the nucleus into two genetically identical daughter nuclei

20. What did we divide now?
 Nucleus
What about the rest?

21. Mitosis is the division of the Nucleus
 Cytokinesis is the division of the cytoplasm and hence the cell
 The division of the cell occurs currently with – telophase
 Mitosis identical in plant and animal cells
 But cytokinesis is different
Cytokinesis occurs after mitosis and is different in plant and animal cells

23. Cytokinesis occurs after mitosis and is different in plant and animal cells

24. http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/activity_description.html
Online Onion Root Tips

25. Chromosomes condense by supercoiling during mitosis

26. Chromosomes condense by supercoiling during mitosis

28. Cyclins are involved in the control of the cell cycle

29. Cyclins are involved in the control of the cell cycle

31. Mutagens, oncogenes and metastasis are involved in the development of primary
and secondary tumours
https://www.cancerresearchuk.org/about-cancer/what-is-cancer
Tumors are abnormal growth of tissue that develop at any stage of life in any part of the body. A cancer is a
malign tumour and is named after the part of the body where the cancer (primary tumour) first develops.
• most common types of cancers
• what causes canser and associated risk factors
• How cancer can be treated

33. Mutagens, oncogenes and metastasis are involved in the development of primary
and secondary tumours

34. Mutagens, oncogenes and metastasis are involved in the development of primary
and secondary tumours

35. Mutagens, oncogenes and metastasis are involved in the development of primary
and secondary tumours

36. Mutagens, oncogenes and metastasis are involved in the development of primary
and secondary tumours

37. Mutagens, oncogenes and metastasis are involved in the development of primary
and secondary tumours

38. Mutagens, oncogenes and metastasis are involved in the development of primary
and secondary tumours