Concepts – Endogamy and DNA Segments

Members of endogamous populations intermarry for generations, creating many segments that match, especially at small centiMorgan levels. These matching segments occur because they are members of the same population – not because they are genealogically related in a recent or … Continue reading

Concepts – Paternal vs Patrilineal and Maternal vs Matrilineal

Sometimes a single word – and its interpretation – makes a world of difference. For example, maternal versus matrilineal and paternal versus patrilineal. What’s the difference and why does it matter? In genetic genealogy, it’s very important. Y and Mitochondrial … Continue reading

Concepts: Anonymized Versus Pseudonymized Data and Your Genetic Privacy

Until recently, when people (often relatives) expressed concerns about DNA testing, genetic genealogy buffs would explain that the tester could remain anonymous, and that their test could be registered under another name; ours, for example. This means, of course, that … Continue reading

Concepts – Sibling and Twin DNA Matching

Lots of people are giving their siblings DNA test kits.  That’s a great idea, especially if your parents aren’t available for testing, because siblings do inherit part of the same DNA from their parents, but not all of the same … Continue reading

Concepts – DNA Recombination and Crossovers

What is a crossover anyway, and why do I, as a genetic genealogist, care? A crossover on a chromosome is where the chromosome is cut and the DNA from two different ancestors is spliced together during meiosis as the DNA … Continue reading

Concepts – Imputation

Until recently, the word imputation wasn’t a part of the vocabulary of genetic genealogy, but earlier this year, it became a factor and will become even more important in coming months. Illumina, the company that provides chips to companies that test … Continue reading

Concepts – Who To Test for Your Father’s DNA

If the first thing you thought when you read the title of this article was, “Well duh – test your father,” you would be right…unless your father is deceased.  Then, it’s not nearly as straightforward, because you have to find … Continue reading

Concepts – Why Genetic Genealogy and Triangulation?

One of the questions often asked is why triangulation in genetic genealogy is so important. Before I answer that, let’s take a look at why genealogists use autosomal DNA for genetic genealogy in the first place. Why Genetic Genealogy? Aside from … Continue reading

Concepts – Percentage of Ancestors’ DNA

A very common question is, “How much DNA of an ancestor do I carry and how does that affect my ethnicity results?” This question is particularly relevant for people who are seeking evidence of a particular ethnicity of an ancestor … Continue reading