Drosophila Lab - A microscopic view of F2 fly progeny with different combinations of traits Drosophila Lab - An assortment of eye and body colors! Drosophila Lab - Deanne helps the students determine how many genes are responsible for eye color in the fly crosses Drosophila Lab - The students count F2 fly progeny to check for any linkage between mutant traits Drosophila Lab - The students count the F1 fly progeny to check for dominant and recessive traits Drosophila Lab - The students determine if the mutant traits are autosomal or sex-linked by counting the F1 fly progeny Drosophila Lab - Travis makes a point by referencing the notes on the board