What was the organism that T.H. Morgan used in his experiments on inheritance?
Pea plant
Fruit fly
Mouse
Bacteria
Explanation: The organism that T.H. Morgan used in his experiments on inheritance was the fruit fly (Drosophila melanogaster). Morgan chose this organism for his experiments because it has a short lifespan, produces a large number of offspring, and has a relatively simple genome. These characteristics made it easy to observe and analyze genetic traits in fruit flies. Morgan's experiments with fruit flies led to many important discoveries, including the identification of sex-linked traits and the mapping of genes on chromosomes. His work laid the foundation for our understanding of the Chromosomal Theory of Inheritance, which states that genes are located on chromosomes and are transmitted through the process of meiosis.
Option 2 is the correct answer.