Name: ________________________
Virtual Fly Lab
You will be performing a cross of Drosophila melanogaster online to determine how genes interact.
Go to our website to click on the link or go to the following address:
http://bioweb.wku.edu/courses/biol114/vfly1.asp
1. Click on the “Genetics info” link to get some good genetics background and to make some
study notes.
2. Read through the whole page of the “Virtual Fly Lab.”
3. Record your definitions and genotypes below:
a. Apterous –
b. Vestigial –
4. What is the genotype of wildtype flies? _______
5. What are the genotypes and phenotypes of the flies they tell you to cross?
6. Go ahead and select your flies and mate them. How many offspring did you get? ____
7. What is the genotype and phenotype of your F1 generation? Is this what you expected? Why or
why not?
8. Go ahead and mate your F1s and fill in the table below for your F2 generation. Use the
examples and definitions given on the website.
Phenotype
Genotype
Number
Proportion
Ratio ( + : v : a )
Wildtype
Vestigial
Apterous
9. Are the phenotypes of the F2 generation what you expected? Show or explain.
Name: ________________________
10. Follow the same steps as above (#5-9) for a cross of your choice. Be sure to include an F1
table of results and an F2 table of your results.
I am crossing:
Table 1: F1 results
Phenotype
Genotype
Number
Proportion
Ratio ( + : v : a )
Wildtype
Vestigial
Apterous
11. Were your results what you expected? Why or why not?
What are your P2 genotypes? ____________________________
Table 2: F2 results
Phenotype
Genotype
Number
Proportion
Wildtype
Vestigial
Apterous
12. Were your results what you expected? Why or why not?
Ratio ( + : v : a )