1. Mitosis

2. Title: Mitosis 8th January 2014
Learning question: What are the names of the stages of mitosis?
Homework:
Complete exam questions by Wednesday15th January
Hook:
What connects these pictures?
(Can you write more than one word?!)

3. Lesson Aims
(d) outline the processes taking place at the G1 and G2 points in the cycle;
(e) describe the appearance of the components of the nucleus and cell during mitosis with reference to: nuclear envelope, centrioles, spindle fibres, centromere, chromatids and chromosomes;

4. Key words…
Mitosis
Prophase
Metaphase
Anaphase
Telophase
Microtubules
Cytokinesis
Chromatid
Chromasome
Centromere
Centriole
Diploid

5. Cell division
All complex organisms originated from a single fertilised egg.
Every cell in your body started here, through cell division the numbers are increased.
Cells then specialise and change into their various roles

7. Mitosis
Mitosis is the process by which new body cell are produced for:
Growth
Replacing damaged or old cells.
This is a complex process requiring is to be split into different stages to understand it.

8. DNA ‘Blueprint of life’ Codes for all the proteins needed for life
Describes that characteristics of every living thing
Every cell with a nucleus contains ALL the instructions to make the organism
dia/journey.swf

9. Chromosomes Each DNA strand is split into chromosomes
All sexually reproducing animals have pairs of chromosomes. One set of each pair comes from each parent
Humans have 23 pairs
Lions have 19 pairs
African wild dogs have 39 pairs
Mosquito have 3 pairs
Some ferns have pairs

10. This (imaginary, example) animal has just two pairs of chromosomes Red = Maternal Blue = Paternal
1p m p 2m
Give out paper chromosomes and an A3 cell outline

11. 1p + copy 1m + copy 2p + copy 2m +copy
During Interphase, each chromosome replicates and produces an exact copy of itself:
1p + copy m + copy p + copy m +copy
Using cut out chromosomes and paperclips, get students to produce tetrads as above

12. There are four stages to Mitosis
Prophase
Metaphase
Anaphase
Telophase
Remember though that this is a continuous process P M A T

13. Interphase Standard condition of cell DNA replicates
Cell enters reproductive cycle with 2 copies of each chromosome

14. Prophase DNA super coils and chromosomes become visible
Nuclear membrane breaks down
Centrioles migrate to poles

15. Metaphase Chromosomes line up centromeres on equator of cell
Centrioles form spindles

16. Anaphase
Spindles ‘grip’ centromeres and chromosomes migrate to poles

17. Telophase Nuclear membranes reform Chromosomes disperse
Cytokinesis begins

18. Interphase
Both daughter cells are exact copies of the parent cell

19. INTERPHASE
MITOSIS

20. Stages of Mitosis

21. In humans, each cell (except sex cells) has how many chromosomes
After mitosis, how many daughter cells are produced?  _______.  After mitosis (in a human cell), each daughter cell has how many chromosomes? _____
How many phases are in MITOSIS? ___________
Which phase of the cell cycle is the longest?  _________
During which phase does cytokinesis begin?  __________
What cell parts migrate to the poles during prophase? __________________.
What structure holds the two chromatids together? ____________________
During which phase does the nuclear membrane dissolve? __________________
What structure moves the chromosomes into position and then pulls them apart? ___________________
What is the overall purpose of mitosis? _________________________
Complete textbook Q1-3

22. Welcome back
Which stage?

23. Lesson Aims
(d) outline the processes taking place at the G1 and G2 points in the cycle;
(e) describe the appearance of the components of the nucleus and cell during mitosis with reference to: nuclear envelope, centrioles, spindle fibres, centromere, chromatids and chromosomes;