Question

Morgan's experiments with Drosophila demonstrated that genes are physically located on chromosomes by showing:

Options

• Sex-linked traits cannot be mapped

• A specific trait corresponded with a specific chromosome

• Chromosomes contain no genetic material

• All traits are inherited identically

Answer 1

Morgan's key finding was the 1:1 correspondence between the white-eye trait (a specific phenotype) and the X chromosome (a specific chromosome). This direct correlation provided experimental proof that genes are physically located on chromosomes, confirming the Chromosomal Theory of Inheritance and demonstrating the practical connection between hereditary traits and cytological structures.