Sex linkage
Sex linkage is the
phenotypic expression of an
allele that is related to the
gender of the individual and is found on the
sex chromosomes. This mode of inheritance is in contrast to the inheritance of traits on
autosomal chromosomes, where both sexes have the same probability of expressing the trait. Since, in humans, there are many more genes on the X than there are on the Y, there are many more X-linked traits than there are Y-linked traits.
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Y linkage
In mammals, Y-linkage refers to when a phenotypic trait is determined by an allele (or gene) on the
Y chromosome. The Y-chromosome is small and does not contain many genes, therefore few traits are Y-linked, and so Y-linked diseases are rare. As only males have a Y chromosome, the genes are simply passed from father to son, with no interchromosomal
genetic recombination.
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Y-linked
A gene on the Y chromosome. A Y-linked gene is by necessity passed from father to son.
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