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Q1:

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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