DNA Genealogy for Dummies
DNA Genealogy: Start Here
New to DNA genealogy? Start here. We'll take you from your first DNA match to your first real genealogy discovery — one simple step at a time.
You don't need to understand genetics to get started.
First: Where are you right now?
Choose the option that sounds like you. There's no wrong place to start.
I already have DNA results
Perfect. You can start right away. We'll show you what to look at first and what to ignore for now.
I haven't taken a DNA test yet
That's okay. Learn what the different DNA tests can tell you and find the right starting point.
Your First 10 Minutes With DNA
If you already have DNA results, forget the complicated stuff for a moment. Your first goal is simply to understand one DNA match.
Here's what to do
You don't need a chromosome browser, haplogroup or advanced DNA theory. Just follow these steps.
Open your DNA matches
Find the section of your testing service that lists the people who share DNA with you.
Pick one match you don't recognize
Don't worry about finding the "right" match. Choose one person whose name or family connection is unfamiliar to you.
Find the shared DNA number
Look for a number followed by cM. This tells you how much DNA you share with that person.
Use that number as your first clue
The amount of shared DNA can help narrow down which relationships are possible.
🔑 The One Number You Need to Know First
cM stands for centimorgan. DNA testing services use it to describe the amount of DNA you share with another person.
For now, remember just this: more shared cM usually means a closer biological relationship.
But cM does not automatically tell you exactly how two people are related. Several relationships can share similar amounts of DNA.
That's enough to start investigating.
🎯 Now Solve Your First DNA Mystery
Take the match you just found. Enter the amount of shared DNA into our relationship calculator and see which relationships are mathematically possible.
🧩 DNA Gives You the Clue. Your Family Tree Explains It.
A DNA match is not the end of the investigation. It's the beginning. The real goal is to connect that DNA match to a person, family branch or shared ancestor.
💾 What About Your Raw DNA?
Once you've seen how DNA matching works, there's another useful thing you can do: download a copy of your Raw DNA Data, if your testing company provides one.
Don't worry about what's inside the file. You don't need to read it yourself.
Availability, features and upload policies vary by genealogy service. Always check the current rules before transferring your data.
🧭 You Do NOT Need to Learn Everything Yet
DNA genealogy can look overwhelming because there are many concepts and tools.
You do not need to understand chromosomes, haplogroups, triangulation, phasing, segment painting or advanced inheritance before you begin.
We'll introduce those concepts when they actually become useful.
What Do You Want to Discover Next?
You've taken your first step. Now choose the direction that matches what you're trying to solve.
🔎 I want to understand my DNA matches
Learn how to organize matches, use shared matches and identify family branches.
🧬 I want to understand DNA
Learn the foundations of autosomal DNA, Y-DNA, mtDNA and genetic inheritance.
🧩 I have a difficult family mystery
Move into chromosome browsers, segments, triangulation and advanced DNA research.
🌳 I'm looking for biological family
Explore resources for adoptees and people researching unknown or unexpected parentage.