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Reebops for National 4 and 5
Looking for similarities and
differences
• Take a look at the animals on the laminated sheets.
• List as many similarities as you can.
• List as many differences as you can.
What do we call these differences?
Variation is all around us; both between species
and within the same species. Let’s look at the
variation within our own species next.
Here’s looking at you!
We are all members of the same species – what similarities and
differences can we spot?
Similarities
Differences
If an alien beamed in ...
How will I know the
humans?
Variation within a population
Discrete
Continuous
Height,
weight, handspan.
Can be
influenced by
environmental
factors.
Displaying your results
Continuous variation
Discrete variation
A fictional family tree!
Where do our genes come from?
Mother
From our parents
egg from
mother
2 copies of
DNA in
nucleus containing
each cell
1 copy of mother’s DNA
Child
Cell divides
DNA from both
parents
Each cell has a
complete set of DNA
Gene Jury
Father
sperm from
father
nucleus containing
1 copy of father’s DNA
2 copies of
DNA in
each cell
Fertilised
egg
nucleus containing
complete set of DNA
(set=2 copies, 1 copy from
each parent)
Making Reebops
The purpose of this practical work is:
• To examine how characteristics are inherited.
• To show how sexual reproduction is
responsible for tremendous variation within a
population.
• Investigate the factors that can influence an
individual’s characteristics.
Reebops
Dad
The kids!
Mum
My Reebop Baby
tails
body segment
antennae
legs
humps
head
eyes
noses
Head: purple play-dough
Body segments: green play-dough
Humps: pink play-dough
Antenna: pink straws
Noses: red or yellow pipe
cleaners
Legs: purple or pink pipe cleaners
Eyes: wiggly eyes
Tails: brown pipe cleaners
Spine: wooden skewer
Reebops
Mum chromosomes
A a
Q q
E e
D d
M m
T t
L
l
Reebops
Dad chromosomes
A a
Q q
E e
D d
M m
T t
L
l
Reebops
Baby No. 1
a a
Q q
E e
D d
M m
T T
L
l
Baby Reebops: Pedigree
• Randomly select one gene from each parent
for the 7 characteristics. Combine them on the
baby Reebop recording sheet.
• Fill in the pedigree for your new baby by
writing down each of its 7 characteristics (e.g.
red nose) on the parcel tag.
• Choose a name for your Reebop.
• Collect the materials that you will need for
your baby and assemble it.
Ideas for discussion:
 Place your Reebop in the “nursery” along with
the other babies
 What do you notice about the features of the
babies?
 How much genetic material does each parent
provide?
 Where is this genetic material stored in the
parent?
 Are there any babies that are identical?
 How many babies are the same as their parents?