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. |
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