Transcript Reebops - Santee School District

Reebops
Your Reebop
 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).
Backpack from http://freebies2deals.com/2012/08/complete-list-of-backpack-deals-going-on-this-week.html
Procedure
 Create a Punnett square for each of the 11 traits,
representing all combinations of alleles the two
parents could make.
Remember:
• both parents are
heterozygous
• carry a dominant gene and a
recessive gene for each trait
• they pass one gene down
from each parent
A
a
A
AA
Aa
a
Aa
aa
Antennae is Aa for heterozygous
Codominate
 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!
Stop signs from http://www.clker.com/clipart-2766.html
Data Table
 Copy the data table into your Science notebook
Trait
Leg Color
Leg Size
Eyes
Humps
Tail
Leg #
Wing #
Body Segment
Nose
Antennae
Sex
Female Gene
Male Gene
Genotype
Phenotype
Procedure
 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.
R
Y
RY
Red
The Charts
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
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 Charts
Leg Color
RR= red YY= yellow RY= orange
Leg Size
LL or Ll= long legs
ll= short legs
Eyes
EE or Ee= 2 eyes
ee= 3 eyes
Humps
MM or Mm= 2 humps
mm= 3 humps
Tail
TT 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 Segment
DD or Dd= 3 body segments
dd= 2 body segments
Nose
QQ= blue PP= yellow QP= green
Antennae
AA 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.
Got a Y from the male
Got a R from the female
R
Y
R
RR
RY
Y
RY
YY
EXAMPLE
So the
baby
would be
this one
Your Reebop
 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