1. Mitosis and Cytokinesis

2. Putting it Together: Mitosis
LT5:
I can demonstrate the processes that cells go through to divide.

3. Mitosis Somatic (body) cell division 5 step process
Growth
Repair
5 step process
Outcome: Production of an identical cell (Diploid)
Why is mitosis easy to see in specimens such as this root tip?

4. Interphase Cells spend most of their time here
Carrying out life processes
Growth
Metabolism
Protein Production
Etc.
DNA is replicated

5. Homologous Chromosomes
The Genetic Material
The genetic material is packaged in the nucleus of the cell
Packaged unit is called a Chromosome
Homologous Chromosomes
Chromosome

6. Prophase Chromosomes begin to condense Spindle fibers form
Tightly coil
Makes it harder to break
Spindle fibers form
Centromeres form
Spindle fibers form

7. Metaphase Sister chromatids line up at the middle of the cell
Mitotic plate
Spindle fibers attach to centromeres

8. Anaphase Spindle fibers shorten Sister chromatids are separated
One of each chromosome goes to each side

9. Telophase Contractile ring begins to form
Cells double check to make sure they have correct number of chromosomes
Nuclear envelope forms
Contractile Ring

10. Cytokinesis
Division of cytoplasm and cell organelles

11. Review

12. Putting it Together: Meiosis
LT5:
I can differentiate between the division of somatic cells and sex cells

13. Meiosis Sex cell division 2 step process
Gamete formation
i.e. Sperm and Egg
2 step process
Meiosis I and II
Outcome: Production sex cells (haploid)

14. Meiosis I

15. Homologous Chromosomes
Tetrads form
Chromosomes with same sequence of genes
Pair and exchange segments of DNA
Ensures genetic diversity (survival)
Called a tetrad (4) 15

16. Meiosis II

17. The Results

18. Quick Write
Identify as many differences between meiosis and mitosis as you can in 1 min.

19. For Extra Help
For more help:
For more help: