Elizabeth (CORMACK) RENFRO – A Nice, Big X Match (Ancestor 45)
If you’ve been studying genetic genealogy for a bit, you may understand X DNA, but I’ll give a summation here.
X DNA is different from regular autosomal DNA. The 23rd chromosomal pair contains the sex chromosomes – those which determine the biological gender of the child. In all but rare cases, biological females have two X chromosomes (XX), and biological males have one X and one Y (XY). As we may have learned in high school or college biology, it is the male’s 23rd chromosome that determines the gender of the child. Continue reading →
This article is the first in a series that William H. Blue, president of the National Blue Family Association (NBFA), invited me to write some time ago about DNA for genealogy. The series is appearing in issues of The Chalice, the NBFA newsletter.
Genetic Genealogy – DNA Testing and You
For those of you who have tried to understand the topic of DNA for genealogy and become overwhelmed, believe me, I understand. You may be relieved to know that I have tried to make it so that this does not happen from reading this article. I am assuming the reader has no knowledge about DNA or DNA testing except what is covered here. Thus, I hope to begin as top level as possible. There is a glossary, and each introduced term will be in copperplate font and will be defined there. Continue reading →
I love genetic genealogy. I encourage DNA testing for genealogy with a passion. I think we all need to be educated about the risks, and to learn the code of ethics, better known as the Genetic Genealogy Standards, which are available for download at Continue reading →
So now that many of us have had our say about AncestryDNA’s failed “New Ancestor Discovery” feature, let’s take a look at what we can do with AncestryDNA. (But PLEASE, continue to have your say about the “New Ancestor Discovery” feature!)
First, I’ll remind you of what Ancestry claims this new feature does (in case anybody questions whether or not it is a failed feature).
I, like I’m sure many users of AncestryDNA, today received an email saying that they found me a new ancestor. Oh boy! That sounded promising. Or exciting. Could they really do that?
Yes, they could if they knew which segments on which chromosomes are inherited from which ancestor, and if they matched that from my matches to my DNA data. And, technically, their database could be big enough to figure that out if they did some really good triangulation. If it were possible to know via DNA things that can only be found through genealogical research, then yes, they could do that.
But, I was doubtful.
The email looks like this.
Okay, cool. So Obadiah Pierce (1774-1836) is my “new ancestor.” I clicked on “Show Me,” and got this. Continue reading →