Morgan's theory of sex-linkage

Morgan's theory of sex-linkage, developed by scientist Thomas Hunt Morgan in the early 20th century, suggests that certain traits are associated with sex chromosomes, specifically the X and Y chromosomes. In humans and many animals, females have two X chromosomes, while males have one X and one Y. Traits linked to the X chromosome can manifest differently in males and females because males have only one copy. This can explain why certain genetic disorders, like color blindness, are more common in males. Morgan's work laid the foundation for understanding how genes are inherited and the role of chromosomes in sex determination.