MHT CET Medical202622 April 2026Morning ShiftBiologyPrinciples of Inheritance and VariationActual
Morgan carried out several dihybrid crosses in Drosophila . Which one of the following crosses helped him find the sex-linked inheritance?
Options
- AYellow-bodied, white-eyed female with the wild type with brown-bodied, red-eyed male.
- BYellow-bodied, red-eyed female with yellow-bodied, white-eyed male.
- CBrown-bodied, white-eyed male with yellow-bodied white-eyed female.
- DYellow-bodied, red-eyed male with white-bodied, white-eyed female.
Correct answer
A. Yellow-bodied, white-eyed female with the wild type with brown-bodied, red-eyed male.
Step-by-step solution
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 i