noun, plural: sex-linked disorders
In humans, the sex chromosomes are the X chromosome and Y chromosome. A female individual possesses two X chromosomes whereas a male has X chromosome and Y chromosome. Since the X chromosome carries more genes that are not found in the Y chromosome, the X chromosome is more commonly linked to genetic mutations and disorders. Usually, the X-linked traits and disorders are expressed more in males than in females because the males have only one copy of the X chromosome.