Females, with their two x chromosomes, have a genetic advantage in this regard. Recognize that males have one x and one y chromosome (xy), while females have two x chromosomes (xx) In humans, the term often refers to traits or disorders influenced by genes on the x chromosome, as it contains many more genes than the smaller y chromosome Whereas in the case of males… the allele present on x chromosome will be directly expressed whether it is recessive or dominant.because males have only one x chromosome Thus x linked traits are more frequently expressed in males than in the females. People with this trait cannot distinguish between the colors red and green
More than one recessive gene on the x chromosome codes for this trait, which is fairly common in males but relatively rare in females (figure below).
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