Answer:
Sex-linked traits are only found on chromosomes that are unique to one sex.
Step-by-step explanation:
In humans, these are the X and Y chromosomes, with X being present in both males and females, while Y is present only in males. Since males have only one X chromosome, any trait carried on the X chromosome will be expressed in males if present, even if it is recessive. Females, on the other hand, have two X chromosomes, so a sex-linked trait must be present on both X chromosomes to be expressed in females.