Define sex linked trait

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A gene present on one of the sex chromosomes X or Y in mammals is a sex-linked trait because its expression depends on the sex of the individual. In humans, as well as in many other animals and some plants, the sex of the individual is determined by sex chromosomes. However, there are other sex determination systems in nature.

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Sex-linked diseases are passed down through families through one of the X or Y chromosomes.

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Sex linkage is the patterns of inheritance and presentation when a gene mutation allele is present on a sex chromosome allosome rather than a non-sex chromosome autosome. They are characteristically different from the autosomal forms of dominance and recessiveness as they are different depending on the sex of the individual. Since humans have several times as many genes on the female X chromosome than on the male Y chromosomeX-linked traits are much more common than Y-linked traits. Additionally, there are more X-linked recessive conditions than X-linked dominantand X-linked recessive conditions affect males much more commonly, due to males only having the one X chromosome required for the condition to present.

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