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Y-Chromosome Testing

The 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.

The Y chromosome along with the X is the sex-determining chromosome that defines the sexual development of a fetus. The difference between a male and a female is the Y chromosome, whereby females are XX and males are XY. As the second X in women is responsible for having children and the development of the female genetalia, the Y chromosome in males is also responsible for procreation. It encourages testicular development and male fertility.

The Y chromosome is passed on from father to son and is accountable for approximately 2% of the total DNA, spanning across around 58 million base pairs of chromosomes. Males usually have 23 pairs of XY chromosomes. There are certain conditions which directly affect Y chromosome expression and these include:

  • XYY syndrome males who inherit an extra Y chromosome
  • Jacobs syndrome
  • Klinefelter syndrome
  • Intersex conditions

A male’s sperm cells are heterogametic. ‘Gametic’ comes from the word gamete which is another word for sperm cells. ‘Hetero’, meaning different, in this case refers to the X and Y chromosomes that are produced by males. Males produce two types sperm (gametes), a Y chromosome and an X chromosome.

When testing male relatives within a family, a Y-STR test may be performed in order to determine whether there is a biological relation. There are several reasons for wanting to test the Y chromosome including: immigration, adoption, sibling matches among others.

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  • Home
  • DNA Tests
    • Paternity Tests
      • Home Paternity Test
      • Legal Paternity Test
      • Immigration DNA Test
      • Prenatal Paternity Test
      • Discreet Test
    • Relationship Tests
      • Siblings DNA Test
      • Aunt & Uncle Test
      • Grandparentage Test
      • Twins DNA Test
      • Y Chromosome Test
      • Maternity Test
    • Prenatal Tests
      • Prenatal Paternity Test
    • Ancestry Tests
      • Ancestral Origins Test
    • Clinical Tests
      • Celiac Disease Genetic Testing
      • Hair Drug Testing
    • Health & Wellbeing Tests
      • NutriFit
      • Lactose Intolerance DNA Test
      • Children’s DNA Discovery
      • Genetic Predisposition test
    • Animal Tests
      • Dog Allergy Test
      • Dog Inherited Disease & Trait Test
      • Dog Parentage Test
    • Other Tests
      • Infidelity DNA Testing
      • DNA Profiles
      • Semen Detection Testing
      • Express Tests
      • Electropherogram
  • About Us
    • Accreditation
    • DNA Testing Laboratory
    • Job Opportunities
    • Media & Press
      • Company News
    • Award in Customer Service
    • Charity Work
  • Testimonials
  • Blog
  • Resources
    • Kits in Different Locations
    • Frequently Asked Questions
    • Payment Options
    • Collecting Samples
    • Create Your Own DNA Kit
    • Understanding Results
    • Multimedia
    • Knowledge Base
  • Contact Us
    • Worldwide Offices
  • Order a DNA Test!

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