"X-linked" refers to genes located on the X chromosome, one of the two sex chromosomes in humans. Males have one X and one Y chromosome, while females have two X chromosomes. Because males have only one X chromosome, any gene on that chromosome will express its traits, even if it is recessive. This can lead to certain genetic disorders being more common in males. In contrast, females have two X chromosomes, so they can be carriers of X-linked traits without showing symptoms. For example, hemophilia and color blindness are X-linked conditions that predominantly affect males. Understanding X-linked inheritance is crucial for genetic counseling and studying hereditary diseases.