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Reebops
Today you are going to take an active part in the conception and birth of a Reebop. A Reebop is a small organism that lives in Junior High School students’ backpacks. You probably haven’t seen one, because they are extremely small. They are known for eating homework and notes from home. Perhaps you have one living amongst your belongings.
Both parents are heterozygous. They each carry a dominant gene and a recessive gene for each trait. Their phenotype (how they look) follows the dominant gene (allele) causing them to look alike. They will pass one gene down from each parent to their offspring (their baby).
Your Reebop
Backpack from http://freebies2deals.com/2012/08/complete-list-of-backpack-deals-going-on-this-week.html
Create a Punnett square for each of the 11 traits, representing all combinations of alleles the two parents could make.
Procedure
Remember:•both parents are heterozygous•carry a dominant gene and a recessive gene for each trait•they pass one gene down from each parent
Antennae is Aa for heterozygous
A
A a
a aA
AA
aa
aA
Some traits are codominate, what does that mean?
How will that change the Punnett square? How will that affect the baby? Do you see any traits that are codominate on the
chart? Do you need to go back and change any of your
Punnett Squares? Find the answers before moving forward from here.
Make sure to tell Mrs. Barker what you found out!
Codominate
Stop signs from http://www.clker.com/clipart-2766.html
Copy the data table into your Science notebook
Data Table
Trait Female Gene Male Gene Genotype Phenotype
Leg Color
Leg Size
Eyes
Humps
Tail
Leg #
Wing #
Body Segment
Nose
Antennae
Sex
Obtain a coin from your teacher. Remember the parents are heterozygous for all the Reebop traits.
Flip the coin for each parent for each trait. Using the chart write down what allele goes with
the coin toss. Continue until all traits are done. Write the genotype in the genotype column (put
the two letters together that you got from the flip). Then write the phenotype (appearance) in the
phenotype column.
Procedure
R Y RY RedEXAMP
LE
The Charts
Trait Heads
Tails
Leg Color R Y
Leg Size L l
Eyes E e
Humps M m
Tail T t
Leg # N n
Wing # W w
Body Segment
D d
Nose Q P
Antennae A a
Sex X Y
The chart on the right will tell you what you need to put in your data table for female gene and the male gene.
Data Chart
The Charts
Leg Color RR= red YY= yellow RY= orange
Leg SizeLL or Ll= long legs
ll= short legs
EyesEE or Ee= 2 eyes
ee= 3 eyes
HumpsMM or Mm= 2 humps
mm= 3 humps
TailTT or Tt= curly tail
tt= straight tail
Leg #NN or Nn= 6 legs
nn= 4 legs
Wing #WW or Ww= 4 wings
ww= 2 wings
Body SegmentDD or Dd= 3 body segments
dd= 2 body segments
Nose QQ= blue PP= yellow QP= green
AntennaeAA or Aa= 2 antennae
aa= no antennae
Sex XX= female XY or YX= male
This chart will tell you what phenotype your Reepob has based on the genotype you got when you flipped the coins.
Procedure
Circle your baby’s trait on each Punnett square.
EXAMPLER
R Y
Y RY
RYRR
YY
Got a Y from the male Got a R from the female So the
baby would be this one
Once you have completed your data table and circled all the traits that your baby has on the Punnett squares you get to start creating your baby
The “Rules” Must use up all the white space You only get one piece of paper Must look neat Remember “ish” is ok
Your Reebop