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Cousinhood

Cousinhood

What is a Cousin? Most of us have one or more in our modern nuclear families. We generally think of them as our aunt’s or uncle’s child. Some of us even are familiar with a second cousin who is the grand child of our grandparents but is not our sibling. But genealogists talk about more distant cousins and it’s often hard to distinguish what genealogists mean by the various terminology. I hope to clarify that here. MRCA To … Read entire article »

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Parent/Child DNA Profile vs Siblings

Parent/Child DNA Profile vs Siblings

  There has been a question about what a parent child DNA profile looks like vs siblings. Here are two example shots. Be aware that the parent child example here also has a blue segment that is in common with me. I share no DNA with the siblings so there are no blue segments there. Even if a siblings shared exactly 50%, it would not be distributed the same as a Parent/Child is. It’s not JUST … Read entire article »

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Which Side of My Family Are We Related On?

Which Side of My Family Are We Related On?

  How Do DNA Tests Connect Us? This is one of those questions that come up time and again. So many times we get new matches who think you’re related only on their maternal side of the family at 23andMe (and sometimes at FTDNA). Why is that and what can be done about it? First Results! If you have taken the 23andMe test, the first results you get back are your haplogroup types. Both men and women get maternal … Read entire article »

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The Changing Borders in Europe

The Changing Borders in Europe

23andMe and AncestryDNA Ethnicity Tools The recent admixture analysis tool at 23andMe “Ancestry Composition” and it’s counterpart at AncestryDNA the “Genetic Ethnicity Summary” has generated a lot of discussion about why none of these types of ethnicity calculation analysis seem to turn out close to correct. Here’s one reminder nipped from my Irish cousin, Gerard Corcoran’s Pinterest blog about how fluid those European country borders are. Not only can societal demarcations alter the free movement of … Read entire article »

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The ABCs of DNA — IBD vs IBS vs mIBC

The ABCs of DNA — IBD vs IBS vs mIBC

IBD vs. IBS When you are matched up to a potential family member at one of the genetic testing services, they do so by finding segments of DNA where the alleles are the same over a minimum distance of both your and your match’s DNA. At least that’s what is supposed to happen. There are several things that can go wrong when matching segments between people and here we’re going to discuss the unfortunate incident of … Read entire article »

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The ABCs of DNA — SNPs

The ABCs of DNA — SNPs

  SNPs   There are two main ways that people are genetically different from each other. Either because they have a variation in the sequence of bases along their chromosomes or because they have a different number of copies of a gene. It is the former situation we’ll discuss here, where the SNPs vary. An SNP, pronounced snip, is shorthand for single nulceotide polymorphism. A nucleotide is a genetic base — Adenine (A), Guanine (G), Cytosine (C) or … Read entire article »

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