The Cell Cycle
Mitosis
Bell Work 2/22/13: Biology (the
study of life) is the only science
in which multiplication means
the same thing as division.
Write an explanation about what
this statement means.
1
1
Objectives:

Describe the relationship among genes,
chromosomes, and inherited traits.
(SPI0707.4.3)

Sequence a series of diagrams that
depict chromosome movement during
plant cell division. (SPI0707.1.4)
2
2
Table of Contents
56. Paper DNA (if you haven’t added it yet)
57. Gallery Walk
Gallery Walk Objectives:
•
For this assignment you will perform a “Gallery Walk”. Each poster in the
Gallery contains a question about chromosomes, DNA, and mutations.
•
Number your paper 1-8 skipping lines between each number.
•
You and your group members must walk from poster to poster answering
each question.
•
All group members must answer all questions, even if you have to make
an educated guess.
•
You will write your answers to the questions in your scientist notebook.
•
If you are confused about a topic at any station, you may use Post-It
notes to write down your questions, and stick them to the posters in the
Gallery. I will review these and we will discuss them tomorrow at the
beginning of class.
•
You will have 1 minute at each poster. Use your time wisely and give
100%! You may switch when the timer sounds
Table of Contents:
58. Mitosis Notes
•50,000
of the cells in your body will die and be
replaced with new cells, all while you have
been reading this sentence!
•It takes about 8 hours for one of your cells to
completely copy its DNA.
•One single cell contains two meters of DNA.
How do little elephants grow up to be BIG
elephants?
The life cycle of a cell is called the
cell cycle. The cell cycle begins
when the cell is formed and ends
when the cell divides and forms
new cells.
Three reasons why cells
reproduce:
Growth
2. Repair
3. Replacement
1.
Skin cancer - the abnormal growth
of skin cells - most often develops
on skin exposed to the sun.
Cells reproduce constantly.
DNA & Chromosomes
Before a cell divides, it must make a
copy of its DNA, or deoxyribonucleic
acid.
 Review: Where is DNA found and what
does it do for the cell?
 DNA is the heredity material that controls
the cells activities, including the making
of new cells.
 The DNA of a cell is organized into
structures called chromosomes.

Chromosomes
Human body cells have
46 chromosomes, or 23
pairs of chromosomes.
 These pairs are made up
of similar chromosomes
known as homologous
chromosomes.

Challenge Questions:
-Why does our DNA
compact into these
chromosome
structures?
-Why do we have 23 pairs
of chromosomes?
Mitosis
Cell division occurs in a series of stages, or phases.
Look @ pgs. 88-89
• Interphase
• Prophase (Mitosis Phase 1)
• Metaphase (Mitosis Phase 2)
• Anaphase (Mitosis Phase 3)
• Telophase (Mitosis Phase 4)
• Cytokinesis
Mitosis Sequences
With your group, sequence the phases of
mitosis in order using the cards.
At the bottom of your notes, draw your
card sequence and justify why this order
is correct.
http://www.cellsalive.com/mitosis.htm
3-2-1 Reflection
3 things you have learned about DNA
and cell division.
2 questions you have about this topic.
1 way you can relate this to the realworld.
01/25/12