WEEK 5: Cell
Replication
LEARNING OUTCOMES
By the end of this week, you
should:
 Have a knowledge and
understanding of the key aspects
of mitosis and cytokinesis.
 Understand that mitosis and
cytokinesis form only part of a
complete cell cycle.
Video clip
How Do Cells
Multiply?
1.
2.
Copy the diagram.
Write a short
paragraph explaining in
your words how you
think cells multiply.
Key terms
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Genetic information is contained in the DNA of
the cell.
DNA stands for deoxyribonucleic acid.
Most of the time, DNA is found in long fibres
called CHROMATIN.
Each long fibre makes up a CHROMOSOME (to
get ready for cell division).
GENES are small sections of chromosomes that
contain the coded information for a specific
protein that determines a cell function or
characteristic.
Why Do Cells Divide?
1)
2)
3)
4)
To replace other cells that have worn out or
damaged.
To allow multi cellular animals to grow.
For asexual reproduction.
Because they get too big!
The Cell
Cycle
What is Mitosis?
1.
2.
Watch the introductory video
Watch this animation and see if
you can define what is happening
Write your own definition of
mitosis and be prepared to read
it out to the rest of the class
Use the following words to help:
Nucleus, two, one, cell,
chromosomes, identical, genetically,
daughter
Mitosis Definition
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Mitosis is the process in which one cell DIVIDES
to make two new cells.
Each cell has the SAME genetic material as the
original cell.
It is like “photocopying” the cell - they are
IDENTICAL.
STUFF TO DO!
1. Write a short description
by each stage of mitosis on
your sheet.
2. Label each stage with the
correct name – use your
textbook page 78
5
Cell membrane pinches in (cytokinesis),
starting to enclose separated chromatids.
3
Chromosomes line up on the equator
attached to the spindle fibres.
2
DNA is replicating and doubling, nucleus is
growing.
6
Two identical daughter cells are formed.
Mitosis has finished.
1
DNA chromatin condenses and forms into
chromosomes.
4
Chromatids are pulled to opposite poles by
the spindle fibres.
Questions
1.
2.
3.

Name three places where you would expect
mitosis to occur in a growing plant.
Name two places where you expect mitosis to
occur in an adult human.
When does mitosis occur in bacteria? What is
this process called?
Write 5 questions in relation to what you have
learnt today, make all the answers either true of
false then swap with at least one other person
and mark theirs.
Mitosis Melodies
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Are you finding the stages of the cell cycle difficult
to remember?
Perhaps a little melody would help! It’s always easy to
remember the words to a song!
In group of 4, you will compose a mitosis melody! Be
sure to include all of the stages of the cell cycle and
all of the major events in each stage.
How to get started…..
1.
2.
3.
4.
5.
Choose a well known melody. For example…”Twinkle,
Twinkle Little Star” or “Jingle bells”
Then, make up words to each verse that describe
the stages of mitosis
EgThere was a human that had a cell
And division was its game-o
P-M-A-T-C, P-M-A-T-C, P-M-A-T-C
And that’s how it divided!
Write out the words to your song (include the
melody)
For bonus marks...and for fun….perform the song for
the class and get everyone to sing along!
Evaluation- /15 marks
Content- 10 marks
 Does your song describe the major events of all
stages of mitosis?
Creativity- 5 marks
 Is your song creative and fun to sing along to?
 Bonus- 3 marks (That’s 20% of the total mark!)
for performing your melody!
Anagrams Race!
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12.
SEAPANAH
CLEYC ELLC
MESOMOOCH
PHATSEELO
ROPESHAP
HOOLGOOMUS
TEEMRORENC
TROAMDICH
IDOLDIP
SAPHERTINE
EATHAMPES
SITMOSI
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12.
ANAPHASE
CELL CYCLE
CHROMOSOMES
TELOPHASE
PROPHASE
HOMOLOGOUS
CENTROMERE
CHROMATID
DIPLOID
INTERPHASE
METAPHASE
MITOSIS