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Y-STR DNA test

What is a Y-STR DNA Test?

Y-STR DNA test is a type of genetic test that studies markers on the Y chromosome, which is passed directly from father to son. Since only males have the Y chromosome, this test is used to trace paternal lineage (father’s side of the family). All biological sons of the same paternal line will have very similar Y-STR profiles.

In simple words, this test shows whether two or more males are related through their father’s side.

When is a Y-STR DNA Test Used?

  • Paternity Testing (When Father is Missing):If the alleged father cannot be tested, a male relative (like grandfather, uncle, or brother) from the father’s side can provide a DNA sample.
  • Ancestry and Lineage Studies:Used to trace family history through the male line, often for surname projects or genealogy.
  • Legal and Inheritance Disputes:Helps prove biological relationships in court when male relatives are involved.
  • Immigration Applications:Sometimes required to prove paternal relationships when documents are missing.
  • Forensic Testing:Useful in criminal investigations where only male DNA is present (for example, in sexual assault cases).

How Does the Y-STR DNA Test Work?

Sample Collection

    • A Specimen is collected from the males being tested.
    • Non-invasive, simple, and painless (Buccal Swab).                       
    • DNA Analysis
      • The lab examines Short Tandem Repeats (STRs) on the Y chromosome.
      • These STR patterns are compared between the tested males.
  • DNA Analysis
    • The lab examines Short Tandem Repeats (STRs) on the Y chromosome.
    • These STR patterns are compared between the tested males.
  • Result Reporting

If the Y-STR profiles match, it strongly supports a shared paternal line

Who Should Consider This Test?

  • Men who want to confirm a biological connection through the father’s side.
  • Families trying to confirm paternity when the father is unavailable.
  • People interested in tracing their surname or paternal ancestry.
  • Legal or immigration cases requiring proof of paternal relationships.

How Does a Y-STR DNA Test – Paternal Lineage Work?

Here’s a step-by-step process:

01.

Sample Collection

A swab is rubbed inside the cheek of the child and alleged father.
02.

Samples to Lab

Samples are sent to an accredited DNA laboratory.
03.

DNA Analysis

Lab compares genetic markers using STR profiling and PCR amplification.
04.

Report Delivery

Reports are delivered via email

The procedure is simple, painless, and highly reliable.

Y-STR DNA Test(FAQs)
Can women use a Y-STR test?
Not directly. Women don’t have a Y chromosome. However, a woman can test her paternal male relatives (brother, father, or uncle) to trace her paternal lineage.
Can a Y-STR test prove who the father is?
No. It can confirm if two men share the same paternal line, but it cannot tell which specific man is the father if multiple close relatives are possible.
How accurate is a Y-STR DNA test?
The test is highly reliable for confirming or excluding paternal line relationships. However, since many male relatives share the same Y chromosome, it is less precise than a standard paternity test.
Does the Y-STR DNA test show ethnicity or full ancestry?
Not exactly. It only traces the paternal line. For full ancestry (both mother’s and father’s sides), an autosomal DNA test is more suitable.