Final answer:
Turner's Syndrome actually refers to a female with only one X chromosome (XO genotype), not a male with an additional X chromosome, which is Klinefelter syndrome (XXY genotype).
Step-by-step explanation:
Turner's Syndrome is false regarding the presence of an additional X chromosome in men. In fact, Turner syndrome is characterized by the presence of only one X chromosome (an XO genotype), leading to a phenotypically female individual with distinct features such as short stature, webbed neck, hearing and cardiac impairments, and sterility. On the other hand, the XYY genotype corresponds to Klinefelter syndrome, which affects males by providing them with an extra X chromosome, resulting in features like small testes, enlarged breasts, reduced body hair, and can present with multiple Barr bodies due to the inactivation of the additional X chromosomes.