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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
      • Non-Invasive 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
      • Non-Invasive Prenatal Paternity Test
      • ‘Prenatal Peace’ – Non-Invasive Prenatal Genetic Screening Test
      • Baby Gender Testing
      • Prenatal Package
    • Ancestry Tests
      • Ancestral Origins Test
    • Health & Wellbeing Tests
      • Children’s DNA Discovery
      • NutriFit
      • Nutri Plan
      • NutriFit Premium (NutriSport)
      • Autism Panel
      • Lactose Intolerance DNA Test
      • Celiac Disease Genetic Testing
      • Genetic Predisposition Test
    • Drug Tests
      • Hair Drug Testing
    • Clinical Tests
      • Inherited Diseases Panel
      • Newborn Genetic Test with NOVA™
      • Baby Gender Testing
      • Celiac Disease Genetic Testing
      • Genetic Screening for Cystic Fibrosis
      • Cancer Panel Genetic Predisposition Test
      • New Clinical Allergy Testing
      • Pharmacogenomics PGx
    • Oncology
      • Inherited Cancer Panel
      • Targeted Sequencing Panel 22 – TSP22™
      • Targeted Sequencing Panel 19- TSP19™
      • Targeted Sequencing Panel 50 – TSP50™
      • BRCA1 & BRCA2
      • Tumour Mutational Burden
      • Sarcoma Panel
      • Circulating Cell-free tumour DNA (cfDNA)
      • Oncomine Comprehensive Targeted Sequencing of DNA and RNA in Cancer
      • Whole Exome Sequencing in Cancer
    • Other Tests
      • Infidelity DNA Testing
      • Semen Detection Testing
      • DNA Profiles
  • 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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Slacks Creek, QLD, 4127

Tel: +61 1300 482 165
Email: info@gtldna.com.au

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COVID-19 STATEMENT

We are monitoring the ongoing Coronavirus (COVID-19) pandemic closely and are complying with the Government’s guidance for the workplace.

Our offices are still open, and we are processing samples and fulfilling orders. To keep you safe we are washing and sanitising our hands before packing orders and they are then placed in our daily mailing services. Unfortunately we cannot allow drop-ins at our office until further notice and all sample collection appointments have been postponed.

The laboratories are still open, are adhering to local guidelines and are processing samples as usual. If delays due to social distancing measures are likely to affect your results due date, then we will inform you immediately.

We are experiencing some delays with all postal and courier deliveries. If you have posted samples back to us but have not received notification that they have been received please track them and check your junk or spam folder before contacting us to request an update.

Please quote your case reference number when contacting us to enable us to respond more quickly.

All results are still being issued on time and you will be contacted if we anticipate any delay with your case.