F1 WORKSHEET – GENETIC MAPPING IN DROSOPHILA

F1 WORKSHEET – GENETIC MAPPING IN DROSOPHILA Name: The first cross is to set up mutant virgin females with wild type males. Adults are allowed to mate for 8 days and then removed from the vial before the offspring emerges, which is typically in 11-14 days. If you scored 28 females and 22 males, populate the table below in the appropriate phenotype area. TABLE 1: Phenotype of F1 Progeny No. of Males No. of Females Total Light brown, Red, Normal Yellow, White, Miniature other (if any) Total Conclusions from F1 results: If the genetic cross was set up correctly, show the phenotype and genotype of the flies that you would expect to see. Students sometimes see F1 offspring with unexpected phenotypes. What is an unexpected phenotype and discuss how these results may have occurred. What you would need to do to complete the experiment if you scored flies with unexpected phenotypes?