If you’re reading this blog, then you obviously want to learn about genealogy. But have you been depending on documents to trace your family history? Perhaps it’s time to start using DNA to uncover even more.
In this blog post, you’ll learn about the 4 DNA tests you can take and what they can do. You will also discover how to get started using this exciting genealogy tool.
In an earlier article, 3 Reasons To Include DNA In Your Genealogy Research, I explained how DNA can help find your ethnicity, verify an ancestral line, and connect with cousins.
Now you’re ready to add DNA to your genealogy toolbox, but don’t know which test to take. Let’s break down the four types of DNA tests and discover how each can help you further your genealogy research.
Basic DNA
First let’s start with a basic DNA lesson.
Humans have 46 chromosomes, arranged in 23 pairs. The first 22 chromosomes (called autosomes) are passed down with half coming from your mom and half from your dad. Because each child gets half, siblings will share some DNA, but not all. This general statement does not include research on identical twins.
Among these pairs, there are special chromosomes called sex chromosomes, which decide whether you are male or female. This pair is #23. These are known as the X and Y chromosomes. Women have two X chromosomes (XX), one from their mother and one from their father. Men have one X chromosome from their mother and one Y chromosome from their father, making their pair XY.
DNA Tests
Autosomal DNA
Autosomal DNA testing is the most popular and widely available choice. It looks at DNA from all your chromosomes, not just those that decide sex. This test can find relatives on both sides of your family tree.
Pros
- Provides an ethnicity estimate
- Can find matches with relatives up to 5-6 generations back
- Useful for both men and women
- Most affordable choice
Cons:
- Less effective for finding distant relatives
- Can’t give proof of a relationship. It is used in combination with other genealogy research
Who should take it? Everyone interested in genealogy should start with an autosomal DNA test. It’s the best all-purpose test for exploring your genetic ancestry.
Companies offering autosomal DNA tests:
- Ancestry – the largest database of matches
- 23andMe – second largest database with health information available
- MyHeritage – best for finding matches outside the United States
- FamilyTreeDNA – includes advanced DNA tools
- LivingDNA – includes ancestry and well-being kits
X-DNA
X-DNA testing looks at the X chromosome. Women have two X chromosomes, while men have one X and one Y. Because of this, the inheritance pattern can be a bit tricky to remember.
A helpful hint: you can never have X-DNA passed down to two males in a row. A father always passes his X chromosome to his daughters, but never his sons. A mother passes one of her two X chromosomes to both sons and daughters. Which one gets passed is random for each child.
Pros:
- Can help verify relationships on your maternal side
- Useful for breaking down brick walls
Cons:
- Limited use compared to autosomal DNA
- Not all companies offer X-DNA
Who should take it? X-DNA testing is most useful for those trying to solve specific genealogy questions on their maternal line. Combine with autosomal testing for the best results.
Companies offering X-DNA testing:
- FamilyTreeDNA (as part of their Family Finder test)
- 23andMe (included in their main test)
Y-DNA
Y-DNA testing focuses on the Y chromosome, which is passed down from father to son. It can trace your direct paternal line far back in time. Women do not have a Y chromosome so it is not used for tracing a female line.
Pros:
- Can trace a paternal line back thousands of years
- Useful for surname projects and finding distant paternal relatives
- Can confirm or disprove direct male-line relationships
Cons:
- Only available for males
- Doesn’t give information about other parts of your family tree
- More expensive than autosomal tests
Who should take it? Men interested in tracing their paternal line or confirming paternal relationships should consider Y-DNA testing. It’s also useful for surname research projects.
Companies offering Y-DNA testing: FamilyTreeDNA
Mitochondrial DNA
Mitochondrial DNA is a special kind of DNA found only in our mitochondria. It is passed from mothers to all their children (males will not pass down mtDNA to their children). So anyone can take this DNA test to learn more about their maternal line.
Pros:
- Can trace a maternal line back thousands of years
- Available for both men and women
- Can help identify your maternal haplogroup
Cons:
- Only traces direct maternal line
- Less useful for recent genealogy
- More expensive than autosomal tests
Who should take it? Anyone interested in tracing their direct maternal line should consider mtDNA testing.
Companies offering mtDNA testing: FamilyTreeDNA
GEDMatch
One other site to consider is GEDMatch. It is a free third-party website that lets you upload data from testing companies. They do not do genetic testing themselves, but act as a gathering place for all of your results.
GEDMatch also has advanced tools when you’re ready to take a deep dive into DNA.
Transferring Your DNA Data
One of the great things about DNA testing is that you can often transfer your raw data between companies. This lets you access different databases and tools without retesting. Here’s where you can transfer your DNA:
- AncestryDNA: No transfers in, but you can download your raw data to use on another site
- MyHeritage: Accepts transfers from AncestryDNA, 23andMe, and FamilyTreeDNA
- FamilyTreeDNA: Accepts transfers from AncestryDNA, 23andMe, and MyHeritage
- LivingDNA: Accepts transfers from AncestryDNA, 23andMe, and MyHeritage
- GEDmatch: Accepts transfers from most major testing companies
Transferring your DNA can expand your list of potential matches and give you access to different analysis tools. It’s a cost-effective way to get more from your first test.
Every testing company has different instructions for copying your raw data. The perfect place to learn about all of them is at this page from the Your DNA Guide website.
Choosing the Right DNA Test for You
With all these options, how do you decide which test to take? Here are some suggestions:
- Start with autosomal DNA testing. It’s the most versatile and affordable choice.
- If you’re male and interested in your paternal line, consider adding a Y-DNA test.
- For deep maternal ancestry, look into mtDNA testing.
- If you’re trying to answer a specific genealogy question, consider which test is most helpful for that situation.
- Remember, you can always do more testing later as your research progresses.
The Future of DNA Testing
DNA testing for genealogy is always changing. New advancements are constantly improving the accuracy and amount of information we can get from our genetics. Some exciting developments to watch for include:
- Improved ethnicity estimates
- Better integration of DNA results with traditional genealogy research
- Advanced tools for analyzing and interpreting DNA data
- Expansion of DNA databases, leading to more matches and connections
As the field grows, it’s likely we’ll see even more sophisticated tests and analysis tools become available.
Ethical Considerations
While DNA testing can be incredibly useful, it’s important to consider the ethical implications:
- Privacy: Your genetic information is personal. Make sure you’re comfortable with how testing companies will use and store your data.
- Unexpected results: DNA testing can sometimes reveal family secrets or unexpected relationships. Be prepared for potentially surprising outcomes.
- Consent: If you’re asking relatives to test, make sure they fully understand what they’re agreeing to.
- Data sharing: Consider carefully before sharing your DNA data or results publicly.
Finally
DNA testing has opened up exciting new ways to further your genealogy research. Whether you’re looking to break down brick walls, connect with living relatives, or explore your ancestral roots, there’s a DNA test that can help.
Remember, DNA testing is a powerful tool, but it’s just one part of genealogy. Combining your genetic results with traditional documentary research will give you the most complete picture of your family history.
So, are you ready? Your genetic family is waiting for you to discover them!
Genealogy tip: DNA doesn’t lie where documents might. Using DNA in your genealogy research is the best way to confirm or disprove family lore, stories, or myths.
DNA can be tricky to use effectively. If you want guidance on what test would be appropriate for your project, give me a call. I can help you start your journey or do the research for you. Just click below.
