When Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny, the F2 ratio deviated very significantly from the 9:3:3:1 ratio. This can be attributed to the fact that:

1. The genes are located on the X and Y chromosomes.
2. Fruit fly has abnormal chromosomes.
3. The genes are located on the X chromosome.
4. The genes exhibit incomplete dominance.
Subtopic:  Chromosomal Basis of Inheritance: Introduction | Chromosomal Basis of Inheritance: Further Considerations | Understanding Linkage |
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