1. Overarching Question: What makes something alive? Guiding Question: How do cells heal your body?

2. Multiplying by Dividing: ■ Procedure: ❑ Get a half sheet of paper and a scissors. ❑ Use the scissors to cut your paper in half, then count the number of paper squares you have. ❑ Stack the paper squares up and cut them in half again. Then count the number of squares. ❑ Repeat this procedure 3 more times. Count the squares each time.

3. Cell Division Activity Chart Number of times cut in half Number of paper squares 1 2 3 4 5 6 7 Predict how many paper squares you would have next!

4. Think about it… ■ The activity modeled cell division (when one cell splits into two). ❑ Why is it important for cells to divide? ❑ How does a person get taller? ❑ How does a broken bone heal itself? ❑ Why do cuts and scrapes disappear? ❑ What is the main purposes for cell division?

5. Topic : Cell Division - Mitosis ■ Questions: ■ Why do cells need to divide? ■ Notes: ■ 3 Reasons Cells Divide: ❑ Growth – So organisms can grow and develop. ❑ Maintenance – To replace worn out or dead cells. ❑ Repair – To fix cuts and scrapes and heal body parts. Page 39

6. Topic : Cell Division - Mitosis ■ Questions: ■ Notes: ■ Interphase: when cells grow and copy their DNA. ■ Cells spend most of their time in interphase. ■ Mitosis: When 1 cell divides and becomes 2 cells. Page 39

7. Topic : Cell Division - Mitosis ■ Questions: ■ What are the stages of cell division? ■ Notes: ■ Mitosis has 5 stages or phases: ■ Cells begin in Interphase. ■ Stage 1: Prophase ■ Stage 2: Metaphase ■ Stage 3: Anaphase ■ Stage 4: Telophase ■ Stage 5: Daughter cells Page 39

8. Multiplying by Dividing Lab: Guided Activity. ■ Interphase: ■ Stage 1: Prophase – mitosis begins. Nucleus

9. Multiplying by Dividing Lab: Guided Activity. ■ Stage 2: Metaphase – chromosomes line up in the middle of the cell. ■ Stage 3: Anaphase – chromosomes move to different sides of a cell.

10. Multiplying by Dividing Lab: Guided Activity. ■ Stage 4: Telophase – the cell begins to divide. ■ Stage 5: Daughter cells – 2 cells are created and go back to interphase. 2 new Nuclei

11. ■ Outline the cell membrane of the cells in these colors: ■ Prophase cells—red ■ Metaphase cells—green ■ Anaphase cells—yellow ■ Telophase cells—orange ■ Interphase cells—purple Multiplying by Dividing Lab: Guided Activity.

12. Cell Cycle – The Stages of Cell Division

13. Cell Division in a Plant’s Root ■ Why would you be able to see cell division occurring in a plant’s root tip?

14. Cell Division Wrap-up: ■ You should be able to answer these questions about cell division ❑ Why is it important for cells to divide? ❑ How does a person get taller? ❑ How does a broken bone heal itself? ❑ Why do cuts and scrapes disappear? ❑ What is the main purposes for cell division?