Final answer:
Thomas Hunt Morgan worked with the fruit fly, Drosophila melanogaster, to study genetics and provided experimental evidence for the Chromosomal Theory of Inheritance.
Step-by-step explanation:
Thomas Hunt Morgan worked with the fruit fly, Drosophila melanogaster, to study genetics.
Morgan and his colleagues performed crosses with the fruit fly, conducted meticulous microscopic observations of fly chromosomes, and correlated their observations with resulting fly characteristics. Their work provided the first experimental evidence to support the Chromosomal Theory of Inheritance, which identified chromosomes as the cellular structures responsible for heredity.
Some traits that Morgan and his colleagues tracked in Drosophila melanogaster include eye color, wing shape, body color, and bristle structure.