Biology Help AP Lab 7 Genetics of Organisms ?

You are given four identical females and four identical males fruit flies(true-breeding flies). You have to figure out the genotype of the flies at the end of a 2 month period. The flies given to you have only two traits that are different than the wild type. If your true-breeding flies die you can not get more. You could get four wild type females and four wild type males if you request. What do you recommend to figure out the genotype? Please do not put do not let the true breeding flies die