Download Fly Meiosis hand out Meiosis Pipe Cleaner Activity GINGER

Fly Meiosis: a Modeling Activity
Name:__________________________________________Date:_______________ Period: __________
Activity Q: How does sexual reproduction lead to genetic variation?
Objective: The objective of this activity is to help you review and better understand the steps of meiosis. After you
have completed this activity you should understand how a diploid cell becomes four haploid cells. In addition, you
should understand the steps involved in this process. You will use pipe cleaners to model the stages of meiosis and
will take notes as you go along so that you will have something to study/review. See BSCS p. 504 for help.
Materials: 3 pipe cleaners dark color; 3 pipe cleaners lighter matching color; cards to organize; poster with cell circles; 4 fly drawings
1. Watch the video on MEIOSIS
Procedure: At lab station..
2. Try to arrange the CARDS on the poster in the correct order beside each appropriate cell.
3. Have your teacher check it and then copy the notes on to your cell diagram.
4. Take out the pipe cleaner chromosomes from one of the bags and arrange them on your cell poster.
NOTE: There are two shades of each color. These represent the DNA that was in the original cell. One piece
originated from one fly parent, the other shade from the second fly parent. This parent is a fly that is
heterozygous for all traits (Genotype: Pp, Gg, and Rr). It has pointed wings, white wings, and red eyes
(phenotype).
5. Use the second bag of pipe cleaners when you need to make copies.
6. Move the chromosomes from stage to stage making sure to follow your directions on the CARDS.
7. As you arrange them, use the colored pencils to copy the pipe cleaner model on to your cell diagram.
8. Keep arranging the chromosomes in each cell until you reach the end. If you do not end up with ONE of each
allele in each cell at the end, you need to go back and try again.
9. Now let’s mate your fly with another lab group’s fly and see what the offspring looks like.
Trait 1: WING SHAPE (PC color: Purple)
P = dark colored PC = pointed wings
p = light colored PC = rounded wings
Trait 2: WING COLOR (PC color: Green)
G = dark colored PC = white wings
g = light colored PC = spotted wings
Trait 3: EYE COLOR (PC color: RED)
R = dark colored PC = red eyes
r = light colored PC = white eyes
10. FOR OFFSPRING 1: Roll the dice (to represent random). You’ll need to roll a 1, 2, 3, or 4, so if you roll a 5 or 6,
you’ll have to re-roll. If you roll a one, write down the alleles for your haploid #1 cell under “offspring 1” below. If you
roll a two, write down alleles for cell #2 under “offspring 1…. etc.
11. Combine alleles with the group next to you to form traits for a baby fly. Fill in data table below. Color the fly you
created on the fly card.
12. Repeat steps 10 and 11 for offspring 2, 3, and 4.
Offspring 1
Alleles:
Offspring 2
Alleles:
Offspring 3
Alleles:
Offspring 4
Alleles:
Genotype after mating:
Genotype after mating:
Genotype after mating:
Genotype after mating:
Phenotype:
Phenotype:
Phenotype:
Phenotype:
Analysis IQIA:
1. Look at the four cells from the group next to you. Did they end up with the same four cells at the end? Why or why
not?
2. What is meant by diploid? Haploid?
3. What is a homologous pair?
4. Go to page 504 in BSCS and look at diagram c. What is crossing over? What happens there? Why did we not
include this in our model?
5. A normal cell in a human has 46 chromosomes. How many will each gamete contain after undergoing meiosis?
6. In mitosis, you ended up with two cells, each with the exact same # of chromosomes in the original cell. What
would have to happen to your cells at the end of meiosis in order to get the exact number of chromosomes that you
had in the starting cell?
CELL DIAGRAM NOTES
1
2
3
4