In an experiment on Drosophila, the true breeding red eyed female is crossed with true breeding white eyed male and all the progeny of F₁ generation were red eyed. When inter crossing is done between the individuals of F₁, what is the ratio of obtaining red eyed females, red eyed males, white eyed males and white eyed females in F₂ generation. 

2 (red eyed females) : 1 (red eyed males) : 1 (white eyed male). In F₂, we obtain red eyed and white eyed flies in 3:1 ratio but out of 3 red eyed flies, 2 are females and one is male. There is one white eyed male. There are no white eyed females. Based on this, Morgan concluded that the genes for eye color were present on X chromosomes but not on Y.