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Overarching Question: What makes something alive?
Guiding Question: How do cells heal your body?
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.
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!
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?
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
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
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
Multiplying by Dividing Lab: Guided Activity.
■ Interphase:■ Stage 1: Prophase –
mitosis begins.
Nucleus
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.
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
■ 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.
Cell Cycle – The Stages of Cell Division
Cell Division in a Plant’s Root
■ Why would you be able to see cell division occurring in a plant’s root tip?
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?