Page "Genetics" Paragraph 10

After the rediscovery of Mendel's work, scientists tried to determine which molecules in the cell were responsible for inheritance.

In 1911, Thomas Hunt Morgan argued that genes are on chromosomes, based on observations of a sex-linked white eye mutation in fruit flies.

In 1913, his student Alfred Sturtevant used the phenomenon of genetic linkage to show that genes are arranged linearly on the chromosome.