Describe sex-linked characteristics and explain... - SS3 Biology Genetics Question

Sex-linked characteristics are traits controlled by genes located on the sex chromosomes (X and Y). Since females have two X chromosomes (XX), they have two copies of genes on the X chromosome, while males have only one X chromosome (XY). Therefore, any recessive allele on the X chromosome will be expressed in males because there is no corresponding allele on the Y chromosome to mask it. This is why sex-linked traits are more commonly observed in males than females.