Fascinating DNA Revelations. A Quick Look at Math and Matches

Genetic Puzzles

The cross roads of genetics and genealogy is a exciting new frontier right now. Individuals everywhere are quick to provide a DNA sample to one of the various testing companies. Then they sit back and wait. Anticipation builds waiting for the grand revelations that the sample will show.

Then the results come back.

When an overwhelming amount of matches and information is suddenly dumped into their laps after weeks of waiting a lot of people are chased off.

For those who actually dig into the matches and start to work out the various connections it can either be a fascinating new addiction or a confusing new version of trigonometry that will make your brain hurt. Often it can be both.

Puzzling it all out.

I went down the rabbit hole of genetic genealogy and quickly found myself hooked. Where traditional genealogy can often be questioned because people can provide incorrect information or people can be confused during records research, DNA doesn’t lie.

Photo by Pixabay on Pexels.com

I have been lucky in the aspect that many of my known relatives have tested with one of the various DNA testing services. It has provided me the opportunity to evaluate various connections and how genetics have passed down through different lines. There have been several revelations have have been interesting to me.

By the numbers.

I share more DNA with my maternal uncle than I do with my paternal half-sister. Both relationships match up for the correct range of shared centimorgans but I found it interesting that I share 300 more cm’s of DNA with an uncle than I do with my half-sibling.

By the chance of recombination in DNA my half-sibling and I both inherited vastly different portions of DNA from our shared parent. I share a heavy dose of DNA with relatives of our shared grandfather, she shares a heavy dose of DNA with our shared grandmother. Our shared DNA is approximately 1500 cm’s.

In fact I share so little DNA with some of the relatives that she matches up to that I would be left to question the validity of those relationships to me if not for her test results.

Final Thought

Don’t use just one test when coming to final conclusions. Just like with traditional genealogy research, it is important to build a case based on various pieces of information and not just one tiny snippet that fits a theory.

Have you had any interesting match math in DNA results?

7 replies »

  1. In my case, a relative testing proved a parent was indeed the parent. The father did not think he was the father because the mother led him to believe the child was from an affair. Sadly, the father didn’t live to learn the truth. I never approached the daughter as she would think it was betraying her father to test. Her daughter tested for fun and proved the relationship.

    Liked by 1 person

    • DNA testing is digging up a lot of skeletons that people thought were never going to see the light of day. In my case I knew my half-sister was my half-sister but I was beginning to question the paternity of my grandmother. Dodged a bullet there! DNA is my passion as of late.

      Liked by 1 person

      • I have one known half-sister, died 10 years before I was born. I am supposed to have two other half-sisters who are on my father’s side. I don’t more about them and hope one day, they or one of their children, if they have any, will test. I would welcome them with open arms although I am not sure if they would be as accepting.

        One thing Mom taught us was family was family. She admitted that not all of her siblings were full siblings, but she never said who the half-siblings were. Through genealogy, I found a half-uncle (maternal grandfather’s son) that died young. He was lost to the family as his sister, was born after he died and they moved out of the area when she was young. I got to visit his grave 5 1/2 years ago, probably the first visit by family in 100+ years. Genealogy showed me that the other half-siblings were the sister to the deceased brother, a sister born to her mother’s first marriage, and the other two siblings (brother and sister) were full siblings. Interestingly, she was closer to the two half-sisters than her full siblings.

        Liked by 1 person

      • I will keep my fingers crossed that you are able to connect with some of your estranged lines. Family can be so complicated. I have several half and adopted siblings. I’m not overly close with any of them because of distance. We all live in different states.

        Liked by 1 person

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