1. Questions to Consider
What changes were critical in getting your cell to divide successfully?
What happens to the organelles in the cytoplasm during cell division?

2. CHAPTER 5
CHROMOSOMES
AND
CELL REPRODUCTION

3. About 2 trillion cells are produced by you every day How many/second?
About 25 million
Egg/Sperm  “Zygote” Embryo  Fetus  Baby

4. THE CELL CYCLE = sequence of growth and division - Interphase
- Mitosis
2 Stages?

6. G1

7. S DNA Replication Exact copies of Chromosomes
**DNA must be copied then distributed

8. DNA
Gene = a segment of DNA
that codes for a protein
Gene
Genes  You

9. Gene Chromosome DNA Chromosome = consists of DNA tightly
coiled around proteins

10. Single? 46
# Pairs? 23
“Somatic cells”
(body cells)
HUMANS

11. Why pairs? Diploid = 2n Mom Dad Pair 1-22 = Autosomes Pair 23 = Sex
Gene 
 Gene
Gene 
 Gene
Pair 1-22 =
Autosomes
Gene 
 Gene
Gene 
 Gene
Pair 23 =
Sex
Chromosomes

12. Human
46 single
Molecules that aid?
G1?
End of S?
46 double
Enzymes

13. G2
Growth/Prep
for Mitosis
“Centrioles”
“Centrioles”

14. MITOSIS Cytokinesis Acronym? PMAT Phases? Prophase Metaphase Anaphase
Telophase
Cytokinesis

15. PMAT 46 46 Cytokinesis 46 46 92 sister chromatids
46 double chromosomes
PMAT 46 46
Cytokinesis 46 46

16. DNA pairs find “partner”
Chromosome 
DNA pairs find “partner”
Sister Chromatids 
Replicated Chromosome
“Homologous Chromosomes”

17. M P
Pairs? 46 T A  

19. YouTube - Mitosis

20. CYTOKINESIS
Animal
Plant
“Cleavage Furrow”
“Cell Plate”

21. Daughter Cells go?
Interphase

22. 3 1
Prophase
Anaphase 4
Which?
Telophase 2
Metaphase 5
Interphase

23. Control of the Cell Cycle
90% time in Interphase
Feedback signals
– “red/green light”
Controlled by proteins

25. Cancer = uncontrolled growth/division of cells
If gene that contains info for cell growth/division is mutated =
Cell growth/division unregulated

26. Tumor “benign tumor” “malignant tumor” Metastasis Therapy?
= a mass of abnormal cells.
“benign tumor”
“malignant tumor”
Metastasis
(start more tumors)
Therapy?
Radiation therapy
Chemotherapy with toxic drugs.
Mammograms 

28. END