1. Wake-up 1. Explain the main events of Interphase. 2.Explain the main events of prophase.

2. Cell Cycle Summary

3. Purpose of the Cell Cycle To grow, replace old cells, or reproduction

4. Location of the Cell Cycle Within an organisms body cells

5. What is a Body Cell? All the cells that make up the “body” of an organism.

6. All organisms have chromosomes (condensed DNA); Also a specific number

7. Total Number of Chromosomes in a Human Body Cell

8. How many chromosomes do other organisms have compared to humans????

9. How many chromosomes are in a dog? 78

10. How many chromosomes are in a mosquito? 6

11. How many chromosomes are in a Adders Tongue Fern? 1262 Most chromosomes of ALL organisms

12. Review of the Stages of Cell Cycle

13. 1 st Step of the Cell Cycle Interphase: Cell prepares to divide by making more organelles and cytoplasm; Replicates DNA

14. 2 nd Step of the Cell Cycle Mitosis: The replicated DNA is separated Made up of PMAT

15. Prophase DNA coils up into chromosomes; nucleus disappears; spindle fibers appear

16. Metaphase Chromosomes line up in the middle of the cell

17. Anaphase Sister chromatids are pulled to opposite ends of the cell

18. Telophase Opposite of Prophase; DNA unwinds; spindle fibers disappear; nucleus reappears

19. 3 rd Step of the Cell Cycle Cytokinesis: The cell divides the organelles and cytoplasm into the new cell

21. End Result of the Cell Cycle Two identical cells with the same number of chromosomes Interphase Mitosis Cytokinesis

22. Summary Diagram Don’t Draw DNA is in chromatin form DNA is replicated during S phase How many Chromosomes? 3 Chromosomes

23. DNA is condensed into chromosomes Metaphase, Anaphase, Telophase Sister Chromatids are separated How many Chromosomes? 3 Chromosomes How many Chromosomes? 3 Chromosomes in each cell

24. If an organism has 50 chromosomes and it undergoes mitosis, how many chromosomes will be present in the new cells?

25. If an organisms diploid number chromosome is 100, how many chromosomes will be present in the new cells?

26. If an organism has 18 chromosomes and it undergoes mitosis, how many chromosomes will be present in the new cells?

27. If an organisms diploid number chromosome is 134,568, how many chromosomes will be present in the new cells? 134, 568