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