In 1913, Alfred Henry Sturtevant published the results of experiments in which he showed how genes are arranged along a chromosome.
Thomas Hunt Morgan
Alfred Henry Sturtevant studied heredity in fruit flies in the US throughout the twentieth century. From 1910 to 1928, Sturtevant worked in Thomas Hunt Morgan’s research lab in New York City, New York. Sturtevant, Morgan, and other researchers established that chromosomes play a role in the inheritance of traits.
Calvin Blackman Bridges studied chromosomes and heredity in the US throughout the early twentieth century.