Have you ever wondered why there is so much variation among members of the same family? Today you are going to try and answer that question.
At the front of the room are Mom and Dad Reebop. They are the “parents” of all the reebop offspring that will be produced in this class. You have an envelope of chromosomes representing Mom (pink) or Dad (blue). Mom and Dad Reebop each have eight pairs of chromosomes for a total of sixteen chromosomes all together. Make sure the lab group across the lab station from you has the opposite color.
9. Each column of eight chromosomes is a sex cell. You have now created four egg cells each with eight chromosomes (the pink chromosomes) or four sperm cells each with eight chromosomes (the blue chromosomes.)
10. Randomly pick two groups of chromosomes representing two of the sex cells and place them back in the envelope.
11. Now randomly pick one of the remaining two groups of chromosomes and switch with the lab partners across the table. You should now have a group of eight pink chromosomes represent an egg cell and a group of eight blue chromosomes representing a sperm cell. Are these sex cell haploid or diploid? ______________________
12. HAVE SEX!! During fertilization, the sperm cell and the egg cell fuse to make one zygote. Put the chromosomes together and turn them printed letter up. Is the zygote haploid or diploid? ___________________________
13. Pair up the chromosomes by letter (this should also correspond to length). The exception to this would be if you have one X chromosome and one Y chromosome. Those should be paired together.
14. There should be sixteen chromosomes for the baby, half pink and half blue. Circle below the chromosomes that came from each parent and then print the baby’s genotype (letters) in the spaces provided.
From Mom (pink) From Dad (blue) Baby’s Genotype
A a A a _______________
M m M m _______________
Q q Q q _______________
T t T t _______________
E e E e _______________
L l L l _______________
D d D d _______________
X X X Y _______________
Use the decoder below to identify the traits of the baby Reebop. Circle the combination.
AA = two antenna EE or Ee = two eyes
Aa = one antenna ee = three eyes
aa = no antenna
MM = one green hump LL or Ll = blue legs or green legs
Mm = two green humps ll = red legs or yellow legs
mm = three green humps
QQ = pink nose DD or Dd = three body segments
Qq = orange nose dd = two body segments
qq = yellow nose
TT or Tt = curly tail XX = female
tt = straight tail XY = male
Draw your baby below. Use colored pencils to show detail.
Use the materials supplied to construct you baby Reebop.
Antenna = paper clips Eyes = thumbtacks
Back humps = green mini marshmallows Legs = push pins
Nose = mini marshmallows Body segments = large marshmellows
Tail = pipe cleaner Male organ = straight pin
Use toothpicks to hold pieces together (ligaments and tendons)
14. Fill out the birth certificate. (Name your baby, write today’s date, list your names under “Delivered by”, and record the sex of the baby.
15. Place your baby on its birth certificate in the “nursery”.