Genetics: Analysis and Principles 5th Edition by Robert Brooker

Exercise 19

In Figure 3.18, Morgan obtained a white-eyed male fly in a population containing many red-eyed flies that he thought were true-breeding. As mentioned in the experiment, he crossed this fly with several red-eyed sisters, and all the offspring had red eyes. But actually this is not quite true. Morgan observed 1237 red-eyed flies and 3 white-eyed males. Provide two or more explanations why he obtained 3 white-eyed males in the F 1 generation.FIGURE 3.18 Inheritance pattern of an X-linked trait in fruit flies.