Why are most sex linked traits observed in males?

Most sex-linked traits are observed in males because these traits are often carried on the X chromosome, which males have only one copy of (XY), while females have two copies (XX). If a male inherits a recessive allele on his X chromosome, he will express the trait because there is no corresponding allele on the Y chromosome to mask it. In contrast, females must inherit two copies of the recessive allele (one from each parent) to express the trait, making it less common in females. This difference in inheritance patterns leads to a higher prevalence of sex-linked traits in males.