Drosophila Genetics Worksheet – Dihybrid Cross Name: Parental Generation : apterous X sepia F1 All wild type flies. Approximately 200 F1 flies were distributed in 16 small vials. After 10 days, the parents were removed. The emerging flies are the F2 generation. We will use the class data collected on November 19 to establish the F2 ratios reported here. Your Vial: Phenotype(s) and numbers: Phenotype(s) and numbers: Class data will be posted on the web (see lab calendar) and it is the class data that will be used in your report.