The recessive traits located on the X-chromosome of humans are always expressed in males e.g. color blindness is a recessive sex-linked trait in which the eye fails to distinguish red and green colors. The gene for the traditional vision is dominant. the traditional gene and its recessive allele are carried by X-chromosomes.
What is a recessive trait?
An inherited trait is outwardly obvious only two copies of the gene for that trait are present—as opposed to a dominant trait where one copy of the gene for the dominant trait is sufficient to display the trait.
