Y-Chromosome TestingThe Y- Chromosome is found only in males and is always found paired with an X-chromosome. The Y-Chromosome is the chromosome which determines sex and is always found with an X chromosome. In issues relating to paternity, paternal lineage and relationship testing it is the sex determining region Y (SRY gene) that is analysed. You may find more information about this on DNA Relationship Testing. The Y chromosome constitutes around 2% of the total DNA found in cells. The Y-chromosome contains information about sperm cell development, and thus missing parts of the chromosome means that fertility is affected. |