What observation did Morgan make when he carried out dihybrid crosses in Drosophila regarding sex-linked genes?

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The two genes segregated independently, resulting in a 9:3:3:1 ratio in the F2 generation.

The two genes did not segregate independently, and the F2 ratio deviated from the expected 9:3:3:1 ratio.

All F2 progeny showed a new combination of traits that was not present in either parent.

The F2 generation showed no variation, indicating a lack of genetic diversity.

answer is B.

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Detailed Solution

Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex-linked.

For example Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny. He observed that the two genes did not segregate independently of each other and the F2 ratio deviated very significantly from the 9:3:3:1 ratio (expected when the two genes are independent).

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