DNA Foundations
Welcome to the DNA Foundations Hub. If you are new to genetic genealogy or deciding which commercial DNA test is right for your research goals, this is your starting point. These guides cover the essential biological principles of DNA inheritance, help you choose the right DNA testing kits, and provide a step-by-step workflow for starting your genetic journey.
For 95% of family tree research, an autosomal DNA test is the best starting point because it traces all your ancestral branches within the last 5 to 6 generations. Specialized direct fäderne (Y-DNA) or möderne (mtDNA) tests are incredibly powerful but are best used to answer highly specific lineage questions further back in time. Always align your testing strategy with the exact branch you want to investigate.
Getting Started with DNA Testing
Beginner’s Guide to Genetic Genealogy
Learn what genetic genealogy is, how DNA complements traditional paper archives, and what to expect when ordering your very first test kit.
Autosomal DNA Testing
The most versatile tool in your arsenal
Explore how autosomal DNA is inherited from both parents, how it dilutes over generations, and how to locate cousins across all ancestral branches.
mtDNA Testing (Maternal Lines)
Tracing the direct mother-line
Understand mitochondrial DNA inheritance. Discover how mtDNA passes unchanged from mother to child and how maternal haplogroups track deep origin.
Y-DNA Testing (Paternal Lines)
Tracing fädernelinjen & surname projects
Discover how the Y-chromosome is passed strictly along the direct paternal line, and how Y-DNA surname projects smash through brick walls.
Combining Multiple DNA Tests
Strategic multi-test workflows
Learn how to combine autosomal, maternal, and paternal DNA testing strategies to solve complex pedigree mysteries and verify overall tree accuracy.
Practical DNA Setup Workflow
Order, test, and manage data safely
Your step-by-step checklist to order test kits, collect saliva safely, download raw DNA files, and manage your matches with maximum privacy.
5 Mistakes to Avoid in DNA Testing
Protect your research and budget
Avoid common rookie pitfalls like testing the wrong relatives, copying unverified trees, misunderstanding ethnicity estimates, and single-database lock-in.
Is DNA Testing Worth It?
Understand ROI & database value
A realistic review of what commercial DNA tests deliver. Learn about database sizes, match frequencies, and how to get maximum value for your money.
Best DNA Tests Compared
AncestryDNA vs 23andMe vs MyHeritage
Compare features, database sizes, raw data upload policies, and chromosome browser availability across the major commercial testing companies.
Understanding DNA Ethnicity Estimates
Science vs consumer marketing
Learn how bio-geographical ethnicity estimates are calculated, why reference panels update, and why ethnicity should never override paper trails.