Which of the following syndromes occurs only in females? Select one: a. Turner's syndrome b. Klinefelter's syndrome c. Fragile X syndrome d. Down syndrome

The correct answer is a. Turner's syndrome.<br /><br />Turner's syndrome is a genetic disorder that occurs only in females. It is characterized by a partial or complete absence of one of the X chromosomes, leading to a variety of physical and developmental symptoms. These symptoms can include short stature, webbed neck, infertility, heart defects, and cognitive impairments.<br /><br />The other options listed are not exclusive to females:<br /><br />b. Klinefelter's syndrome is a genetic disorder that occurs in males and is characterized by an extra X chromosome, resulting in symptoms such as tall stature, reduced muscle mass, gynecomastia (enlarged breast tissue), and infertility.<br /><br />c. Fragile X syndrome is a genetic disorder that can affect both males and females. It is caused by a mutation in the FMR1 gene, leading to intellectual disability, developmental delays, and physical characteristics such as a long face, large ears, and a prominent jaw.<br /><br />d. Down syndrome is a genetic disorder that can occur in both males and females. It is caused by an extra copy of chromosome 21, leading to intellectual disability, developmental delays, and distinct physical features such as a flat face, small ears, and a single palmar crease.<br /><br />Therefore, the correct answer is a. Turner's syndrome, as it is the only syndrome among the options listed that occurs exclusively in females.