You are a fly geneticist and notice two different fly variants in your bottles of flies. one is uncoordinated (u) and the other has orange eyes (o). you propagate these flies until these characteristics are true-breeding. you then set up two crosses. cross 1 is between orange-eyed females and uncoordinated males. you find that all the f1 flies have normal red eyes and are coordinated. cross 2 is the reciprocal (uncoordinated females and orange-eyed males), and the f1 progeny of this cross are red-eyed coordinated females and red-eyed uncoordinated males. which of the genes is on the x chromosome?