Blog on DNA Testing and Paternity Testing

Y chromosome Testing for Male Lineage

Posted on | February 29, 2012 | 1 Comment

Male relatives can confirm their biological relationship by doing a Y chromosome test. The Y chromosome is only found in males and is a sex determining chromosome.

Y Chromosome
The Y Chromosome encodes characteristics for “maleness”

If two males share the same Y chromosome it means that they also have the same paternal lineage.

Testing the Y chromosome can be done for the following reasons:

  • To test whether male siblings share the same biological father or other direct male biological relative. This can also be applied to genealogy and family tree research- with this test you can confirm whether you are related to someone you suspect is close relative or distant cousin.
  • In ancestry DNA testing,  a paternal lineage test enables people to find out their ancient paternal ancestor, determining their regional and population affiliations.

The Y chromosome contains far fewer genes than the X chromosome. In fact it is estimated that the Y chromosome has only somewhere between 70-200 chromosomes out of the total estimated number of genes of around 25,000.

The future of the Y chromosome

Many hundreds of millennia ago, the Y and X chromosomes carried the same number of genes. Over the centuries the Y chromosome has lost the number of genes it carries. The chromosome has also shrunk considerably when compared to the Y chromosome of our ancient paternal forefathers.

A Y chromosome test is extremely conclusive at determining male lineage- however, as things stand, the Y chromosome might altogether disappear one day.


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