Y linkage

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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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