Sunday, May 26, 2019

Visualizing your Tree - With Expected Autosomal & X DNA Shared

I've mentioned the very cool Exploring Family Trees tool before, which allows you to upload a Gedcom file and quickly visualize your family tree.  I just uploaded a new Gedcom file and noticed that some useful features have been added, which can help you understand how much DNA you may have inherited from a particular ancestor.
Descendants of Avraham Rutner, my 5th great grandfather

Above, you can see a visualization of descendants of my 5th great grandfather, Avraham Rutner.  You can see that his descendants were marrying cousins (although most were distantly enough related that they may not have even known of a relationship).  You can also see how many branches didn't make it beyond 1944.

By hovering over the dots representing individuals, you can see the amount of Avraham Rutner's DNA each of his descendants would be expected to have inherited:
Eszter Rutner's Connected to Avraham Rutner
Eszter Rutner (not my great grandmother, although they had the same name) was descended from Avraham Rutner through both of her parents.  This tool correctly highlights both paths from Eszter up to Avraham, and it identifies that she's a great-great granddaughter (twice).  About 12.5% of her autosomal DNA should be from Avraham Rutner, and 6.25% of her X.  It's important to remember that she could have inherited more or less than this--but this is the average amount she'd have been expected to inherit.

This tools works in the reverse also.  You can look at an individual and see how much DNA they'd have inherited from various ancestors.
My Direct Ancestors (back 7 generations)
If I display my direct ancestors you can easily see that I have some pedigree collapse--on the top left of the image you can see that I have several ancestors who are in my tree more than once.  I can hover over any of those ancestors to find out how much DNA I'd be expected to have inherited from each.
Expected Shared DNA 
When I hover over my great grandmother Mollie, I'm told that about 12.5% of my DNA is hers, while about 25% of my X chromosome is, due to how the X is inherited.  (It also tells me that I have identified all four of my great grandmothers in this tree.)

You can also click a box on the upper right for "Highlight X DNA Contributions" which will highlight those ancestors from which you inherited any X DNA.

Try this out and share it around.  This is a great tool, and it looks like there are semi-regular feature updates!

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  1. This looks very cool! I like how it shows the double relationships. Thanks for sharing.

  2. I'm looking forward to tinkering with this tool, and seeing how it can help me with data visualization for a genetic case study I'm working on for descendants of a possible 6th great-grandfather. Thank you for sharing, Lara.