"Sex-linked" refers to genes that are located on the sex chromosomes, which determine an individual's sex. In humans, these chromosomes are the X and Y chromosomes. Traits linked to these genes can be inherited differently in males and females due to the presence of one or two X chromosomes. For example, males have one X and one Y chromosome, while females have two X chromosomes. Many genetic disorders are sex-linked, with hemophilia and color blindness being common examples. These conditions often manifest more frequently in males because they have only one X chromosome. If a male inherits a recessive allele for a disorder on his X chromosome, he will express the trait, while females may be carriers without showing symptoms if they have a normal allele on their other X chromosome.