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Y LinkageY-linkage is a gene found on the Y chromosome, but not the X chromosome. It is a characteristic of a genetic disease only present in men, passed on to sons, because only men have a Y-chromosome. The Y-chromosome is small and does not contain many genes, therefore few traits are Y-linked. It is speculated that some of these genes include the formation of testes and masculinization in the fetus. See also - http://www.wrongdiagnosis.com/genetics/ygene.htm
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