Biology - Principles of Inheritance and Variation Question with Solution | TestHub

Morgan carried out several dihybrid crosses in Drosophila to study genes that were sex-linked. The crosses were similar to the dihybrid crosses carried out by Mendel in peas.

Morgan hybridized yellow-bodied, white-eyed females to brown-bodied, red-eyed males (wild type) 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 expected $9:3:3:1$ ratio. This cross helped him establish the concept of sex-linked inheritance and linkage.

Answer: Yellow-bodied, white-eyed female with the wild type with brown-bodied, red-eyed male.